8016650640 has 120 divisors (see below), whose sum is σ = 26947342968. Its totient is φ = 2135808000.

The previous prime is 8016650617. The next prime is 8016650659. The reversal of 8016650640 is 460566108.

8016650640 is a `hidden beast` number, since 8 + 0 + 1 + 6 + 6 + 5 + 0 + 640 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 615833856 + 7400816784 = 24816^2 + 86028^2 .

It is a tau number, because it is divible by the number of its divisors (120).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 8016650595 and 8016650604.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 886140 + ... + 895140.

Almost surely, 2^8016650640 is an apocalyptic number.

8016650640 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 8016650640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13473671484).

8016650640 is an abundant number, since it is smaller than the sum of its proper divisors (18930692328).

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

8016650640 is a wasteful number, since it uses less digits than its factorization.

8016650640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10257 (or 10248 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

The square root of 8016650640 is about 89535.7506250995. The cubic root of 8016650640 is about 2001.3865917928.

The spelling of 8016650640 in words is "eight billion, sixteen million, six hundred fifty thousand, six hundred forty".