172561983321 has 192 divisors, whose sum is σ = 314178600960. Its totient is φ = 83250478080.

The previous prime is 172561983311. The next prime is 172561983323. The reversal of 172561983321 is 123389165271.

It is not a de Polignac number, because 172561983321 - 2⁵ = 172561983289 is a prime.

It is not an unprimeable number, because it can be changed into a prime (172561983323) by changing a digit.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 121265616 + ... + 121267038.

It is an arithmetic number, because the mean of its divisors is an integer number (1636346880).

Almost surely, 2^172561983321 is an apocalyptic number.

It is an amenable number.

172561983321 is a deficient number, since it is larger than the sum of its proper divisors (141616617639).

172561983321 is a wasteful number, since it uses less digits than its factorization.

172561983321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1596 (or 1589 counting only the distinct ones).

The product of its digits is 544320, while the sum is 48.

The spelling of 172561983321 in words is "one hundred seventy-two billion, five hundred sixty-one million, nine hundred eighty-three thousand, three hundred twenty-one".