165221132042644 has 48 divisors (see below), whose sum is σ = 304590721881600. Its totient is φ = 78201966818016.

The previous prime is 165221132042621. The next prime is 165221132042657. The reversal of 165221132042644 is 446240231122561.

It is a self number, because there is not a number n which added to its sum of digits gives 165221132042644.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1028572167 + ... + 1028732785.

It is an arithmetic number, because the mean of its divisors is an integer number (6345640039200).

Almost surely, 2^{165221132042644} is an apocalyptic number.

It is an amenable number.

165221132042644 is a deficient number, since it is larger than the sum of its proper divisors (139369589838956).

165221132042644 is a wasteful number, since it uses less digits than its factorization.

165221132042644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171052 (or 171050 counting only the distinct ones).

The product of its (nonzero) digits is 552960, while the sum is 43.

The spelling of 165221132042644 in words is "one hundred sixty-five trillion, two hundred twenty-one billion, one hundred thirty-two million, forty-two thousand, six hundred forty-four".