172815126385 has 24 divisors (see below), whose sum is σ = 229025055168. Its totient is φ = 125087978400.

The previous prime is 172815126371. The next prime is 172815126437. The reversal of 172815126385 is 583621518271.

172815126385 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 172815126385 - 2⁵ = 172815126353 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 549229 + ... + 804538.

It is an arithmetic number, because the mean of its divisors is an integer number (9542710632).

Almost surely, 2^172815126385 is an apocalyptic number.

It is an amenable number.

172815126385 is a deficient number, since it is larger than the sum of its proper divisors (56209928783).

172815126385 is a wasteful number, since it uses less digits than its factorization.

172815126385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1354005 (or 1353994 counting only the distinct ones).

The product of its digits is 806400, while the sum is 49.

The spelling of 172815126385 in words is "one hundred seventy-two billion, eight hundred fifteen million, one hundred twenty-six thousand, three hundred eighty-five".