1666163520 has 336 divisors, whose sum is σ = 6794406528. Its totient is φ = 380712960.

The previous prime is 1666163501. The next prime is 1666163533. The reversal of 1666163520 is 253616661.

It is a tau number, because it is divible by the number of its divisors (336).

It is a super-2 number, since 2×1666163520² = 5552201750757580800, which contains 22 as substring.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 542790 + ... + 545850.

It is an arithmetic number, because the mean of its divisors is an integer number (20221448).

Almost surely, 2^1666163520 is an apocalyptic number.

1666163520 is a gapful number since it is divisible by the number (10) 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 1666163520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3397203264).

1666163520 is an abundant number, since it is smaller than the sum of its proper divisors (5128243008).

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

1666163520 is an equidigital number, since it uses as much as digits as its factorization.

1666163520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3100 (or 3078 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 36.

The square root of 1666163520 is about 40818.6663182422. Note that the first 3 decimals coincide. The cubic root of 1666163520 is about 1185.5117802213.

The spelling of 1666163520 in words is "one billion, six hundred sixty-six million, one hundred sixty-three thousand, five hundred twenty".