172561983320 has 64 divisors (see below), whose sum is σ = 401303185920. Its totient is φ = 66742190464.

The previous prime is 172561983311. The next prime is 172561983323. The reversal of 172561983320 is 23389165271.

It is a Harshad number since it is a multiple of its sum of digits (47).

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 396902 + ... + 708981.

It is an arithmetic number, because the mean of its divisors is an integer number (6270362280).

Almost surely, 2^172561983320 is an apocalyptic number.

172561983320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

172561983320 is an abundant number, since it is smaller than the sum of its proper divisors (228741202600).

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

172561983320 is a wasteful number, since it uses less digits than its factorization.

172561983320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1106024 (or 1106020 counting only the distinct ones).

The product of its (nonzero) digits is 544320, while the sum is 47.

The spelling of 172561983320 in words is "one hundred seventy-two billion, five hundred sixty-one million, nine hundred eighty-three thousand, three hundred twenty".