172865578816 has 56 divisors (see below), whose sum is σ = 393085848320. Its totient is φ = 73886556672.

The previous prime is 172865578763. The next prime is 172865578817. The reversal of 172865578816 is 618875568271.

172865578816 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (56).

It is a Harshad number since it is a multiple of its sum of digits (64).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172865578817) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 350136 + ... + 684343.

Almost surely, 2^172865578816 is an apocalyptic number.

172865578816 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

172865578816 is an abundant number, since it is smaller than the sum of its proper divisors (220220269504).

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

172865578816 is a wasteful number, since it uses less digits than its factorization.

172865578816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1034871 (or 1034861 counting only the distinct ones).

The product of its digits is 45158400, while the sum is 64.

The spelling of 172865578816 in words is "one hundred seventy-two billion, eight hundred sixty-five million, five hundred seventy-eight thousand, eight hundred sixteen".