8366861520 has 320 divisors, whose sum is σ = 29601676800. Its totient is φ = 2171473920.

The previous prime is 8366861519. The next prime is 8366861521. The reversal of 8366861520 is 251686638.

8366861520 is a `hidden beast` number, since 8 + 3 + 6 + 6 + 8 + 615 + 20 = 666.

It is an interprime number because it is at equal distance from previous prime (8366861519) and next prime (8366861521).

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8366861521) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 13648734 + ... + 13649346.

It is an arithmetic number, because the mean of its divisors is an integer number (92505240).

Almost surely, 2^8366861520 is an apocalyptic number.

8366861520 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 8366861520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14800838400).

8366861520 is an abundant number, since it is smaller than the sum of its proper divisors (21234815280).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

8366861520 is a wasteful number, since it uses less digits than its factorization.

8366861520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 795 (or 783 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 45.

The square root of 8366861520 is about 91470.5500147452. The cubic root of 8366861520 is about 2030.1160295089.

The spelling of 8366861520 in words is "eight billion, three hundred sixty-six million, eight hundred sixty-one thousand, five hundred twenty".