165988915926 has 64 divisors (see below), whose sum is σ = 354472132608. Its totient is φ = 51635985408.

The previous prime is 165988915907. The next prime is 165988915933. The reversal of 165988915926 is 629519889561.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 43303306 + ... + 43307138.

It is an arithmetic number, because the mean of its divisors is an integer number (5538627072).

Almost surely, 2^165988915926 is an apocalyptic number.

165988915926 is an abundant number, since it is smaller than the sum of its proper divisors (188483216682).

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

165988915926 is a wasteful number, since it uses less digits than its factorization.

165988915926 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7325.

The product of its digits is 83980800, while the sum is 69.

The spelling of 165988915926 in words is "one hundred sixty-five billion, nine hundred eighty-eight million, nine hundred fifteen thousand, nine hundred twenty-six".