165239955774 has 224 divisors, whose sum is σ = 395718743808. Its totient is φ = 51648192000.

The previous prime is 165239955739. The next prime is 165239955781. The reversal of 165239955774 is 477559932561.

165239955774 is a `hidden beast` number, since 1 + 6 + 5 + 2 + 3 + 9 + 9 + 557 + 74 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 111 ways as a sum of consecutive naturals, for example, 201266284 + ... + 201267104.

Almost surely, 2^165239955774 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 165239955774, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (197859371904).

165239955774 is an abundant number, since it is smaller than the sum of its proper divisors (230478788034).

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

165239955774 is an equidigital number, since it uses as much as digits as its factorization.

165239955774 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1006 (or 991 counting only the distinct ones).

The product of its digits is 71442000, while the sum is 63.

The spelling of 165239955774 in words is "one hundred sixty-five billion, two hundred thirty-nine million, nine hundred fifty-five thousand, seven hundred seventy-four".