161625633424 has 20 divisors (see below), whose sum is σ = 313442634940. Its totient is φ = 80737211520.

The previous prime is 161625633401. The next prime is 161625633457. The reversal of 161625633424 is 424336526161.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 46207801600 + 115417831824 = 214960^2 + 339732^2 .

It is a super-2 number, since 2×161625633424² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4707687 + ... + 4741894.

It is an arithmetic number, because the mean of its divisors is an integer number (15672131747).

Almost surely, 2^161625633424 is an apocalyptic number.

It is an amenable number.

161625633424 is a deficient number, since it is larger than the sum of its proper divisors (151817001516).

161625633424 is a wasteful number, since it uses less digits than its factorization.

161625633424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9450658 (or 9450652 counting only the distinct ones).

The product of its digits is 622080, while the sum is 43.

The spelling of 161625633424 in words is "one hundred sixty-one billion, six hundred twenty-five million, six hundred thirty-three thousand, four hundred twenty-four".