165145661506644 has 96 divisors (see below), whose sum is σ = 479153788490496. Its totient is φ = 43105880125440.

The previous prime is 165145661506613. The next prime is 165145661506663. The reversal of 165145661506644 is 446605166541561.

It is a super-2 number, since 2×165145661506644² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 779441967 + ... + 779653814.

It is an arithmetic number, because the mean of its divisors is an integer number (4991185296776).

Almost surely, 2^{165145661506644} is an apocalyptic number.

165145661506644 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

165145661506644 is an abundant number, since it is smaller than the sum of its proper divisors (314008126983852).

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

165145661506644 is a wasteful number, since it uses less digits than its factorization.

165145661506644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1559095905 (or 1559095903 counting only the distinct ones).

The product of its (nonzero) digits is 62208000, while the sum is 60.

The spelling of 165145661506644 in words is "one hundred sixty-five trillion, one hundred forty-five billion, six hundred sixty-one million, five hundred six thousand, six hundred forty-four".