165697619328 has 512 divisors, whose sum is σ = 532998144000. Its totient is φ = 50480381952.

The previous prime is 165697619317. The next prime is 165697619333. The reversal of 165697619328 is 823916796561.

165697619328 is a `hidden beast` number, since 1 + 6 + 5 + 6 + 9 + 7 + 619 + 3 + 2 + 8 = 666.

It is a Smith number, since the sum of its digits (63) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 395459503 + ... + 395459921.

It is an arithmetic number, because the mean of its divisors is an integer number (1041012000).

Almost surely, 2^165697619328 is an apocalyptic number.

165697619328 is a gapful number since it is divisible by the number (18) 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 165697619328, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (266499072000).

165697619328 is an abundant number, since it is smaller than the sum of its proper divisors (367300524672).

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

165697619328 is a wasteful number, since it uses less digits than its factorization.

165697619328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 639 (or 621 counting only the distinct ones).

The product of its digits is 29393280, while the sum is 63.

The spelling of 165697619328 in words is "one hundred sixty-five billion, six hundred ninety-seven million, six hundred nineteen thousand, three hundred twenty-eight".