161621655324 has 24 divisors (see below), whose sum is σ = 377257307280. Its totient is φ = 53853869184.

The previous prime is 161621655319. The next prime is 161621655373. The reversal of 161621655324 is 423556126161.

It is a super-2 number, since 2×161621655324² (a number of 23 digits) contains 22 as substring.

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, 2468329 + ... + 2532960.

It is an arithmetic number, because the mean of its divisors is an integer number (15719054470).

Almost surely, 2^161621655324 is an apocalyptic number.

It is an amenable number.

161621655324 is an abundant number, since it is smaller than the sum of its proper divisors (215635651956).

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

161621655324 is a wasteful number, since it uses less digits than its factorization.

161621655324 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5003989 (or 5003987 counting only the distinct ones).

The product of its digits is 259200, while the sum is 42.

The spelling of 161621655324 in words is "one hundred sixty-one billion, six hundred twenty-one million, six hundred fifty-five thousand, three hundred twenty-four".