165541621406932 has 24 divisors (see below), whose sum is σ = 294273498923712. Its totient is φ = 81467410684800.

The previous prime is 165541621406929. The next prime is 165541621406939. The reversal of 165541621406932 is 239604126145561.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165541621406939) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 491309694 + ... + 491646517.

It is an arithmetic number, because the mean of its divisors is an integer number (12261395788488).

Almost surely, 2^{165541621406932} is an apocalyptic number.

It is an amenable number.

165541621406932 is a deficient number, since it is larger than the sum of its proper divisors (128731877516780).

165541621406932 is a wasteful number, since it uses less digits than its factorization.

165541621406932 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 982956879 (or 982956877 counting only the distinct ones).

The product of its (nonzero) digits is 9331200, while the sum is 55.

The spelling of 165541621406932 in words is "one hundred sixty-five trillion, five hundred forty-one billion, six hundred twenty-one million, four hundred six thousand, nine hundred thirty-two".