172907445881 has 4 divisors (see below), whose sum is σ = 177580620132. Its totient is φ = 168234271632.

The previous prime is 172907445839. The next prime is 172907445883. The reversal of 172907445881 is 188544709271.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 82306445881 + 90601000000 = 286891^2 + 301000^2 .

It is a cyclic number.

It is not a de Polignac number, because 172907445881 - 2³⁰ = 171833704057 is a prime.

It is a super-2 number, since 2×172907445881² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (172907445883) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2336587070 + ... + 2336587143.

It is an arithmetic number, because the mean of its divisors is an integer number (44395155033).

Almost surely, 2^172907445881 is an apocalyptic number.

It is an amenable number.

172907445881 is a deficient number, since it is larger than the sum of its proper divisors (4673174251).

172907445881 is an equidigital number, since it uses as much as digits as its factorization.

172907445881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4673174250.

The product of its (nonzero) digits is 4515840, while the sum is 56.

The spelling of 172907445881 in words is "one hundred seventy-two billion, nine hundred seven million, four hundred forty-five thousand, eight hundred eighty-one".