172391231238156 has 96 divisors (see below), whose sum is σ = 540835235297280. Its totient is φ = 46357305875712.

The previous prime is 172391231238077. The next prime is 172391231238169. The reversal of 172391231238156 is 651832132193271.

172391231238156 is a `hidden beast` number, since 1 + 7 + 2 + 391 + 2 + 3 + 1 + 238 + 15 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6706773300 + ... + 6706799003.

It is an arithmetic number, because the mean of its divisors is an integer number (5633700367680).

Almost surely, 2^{172391231238156} is an apocalyptic number.

It is an amenable number.

172391231238156 is an abundant number, since it is smaller than the sum of its proper divisors (368444004059124).

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

172391231238156 is a wasteful number, since it uses less digits than its factorization.

172391231238156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13413572340 (or 13413572332 counting only the distinct ones).

The product of its digits is 3265920, while the sum is 54.

The spelling of 172391231238156 in words is "one hundred seventy-two trillion, three hundred ninety-one billion, two hundred thirty-one million, two hundred thirty-eight thousand, one hundred fifty-six".