165978574944 has 576 divisors, whose sum is σ = 568948847040. Its totient is φ = 41943121920.

The previous prime is 165978574907. The next prime is 165978574991. The reversal of 165978574944 is 449475879561.

Its product of digits (304819200) is a multiple of the sum of its prime divisors (768).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 306799314 + ... + 306799854.

It is an arithmetic number, because the mean of its divisors is an integer number (987758415).

Almost surely, 2^165978574944 is an apocalyptic number.

165978574944 is a gapful number since it is divisible by the number (14) 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 165978574944, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (284474423520).

165978574944 is an abundant number, since it is smaller than the sum of its proper divisors (402970272096).

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

165978574944 is a wasteful number, since it uses less digits than its factorization.

165978574944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 783 (or 768 counting only the distinct ones).

The product of its digits is 304819200, while the sum is 69.

The spelling of 165978574944 in words is "one hundred sixty-five billion, nine hundred seventy-eight million, five hundred seventy-four thousand, nine hundred forty-four".