165990432526 has 16 divisors (see below), whose sum is σ = 262109062800. Its totient is φ = 78621375168.

The previous prime is 165990432427. The next prime is 165990432563. The reversal of 165990432526 is 625234099561.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 401970 + ... + 702538.

It is an arithmetic number, because the mean of its divisors is an integer number (16381816425).

Almost surely, 2^165990432526 is an apocalyptic number.

165990432526 is a deficient number, since it is larger than the sum of its proper divisors (96118630274).

165990432526 is a wasteful number, since it uses less digits than its factorization.

165990432526 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 315123.

The product of its (nonzero) digits is 3499200, while the sum is 52.

The spelling of 165990432526 in words is "one hundred sixty-five billion, nine hundred ninety million, four hundred thirty-two thousand, five hundred twenty-six".