161952201938 has 54 divisors (see below), whose sum is σ = 272665165743. Its totient is φ = 72119646720.

The previous prime is 161952201893. The next prime is 161952202019. The reversal of 161952201938 is 839102259161.

It can be written as a sum of positive squares in 5 ways, for example, as 71638128409 + 90314073529 = 267653^2 + 300523^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=284563.

It is a junction number, because it is equal to n+sod(n) for n = 161952201892 and 161952201901.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 183827258 + ... + 183828138.

Almost surely, 2^161952201938 is an apocalyptic number.

161952201938 is a deficient number, since it is larger than the sum of its proper divisors (110712963805).

161952201938 is an frugal number, since it uses more digits than its factorization.

161952201938 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1836 (or 919 counting only the distinct ones).

The product of its (nonzero) digits is 233280, while the sum is 47.

The spelling of 161952201938 in words is "one hundred sixty-one billion, nine hundred fifty-two million, two hundred one thousand, nine hundred thirty-eight".