172136373125 has 20 divisors (see below), whose sum is σ = 220348025436. Its totient is φ = 134350320000.

The previous prime is 172136373121. The next prime is 172136373137. The reversal of 172136373125 is 521373631271.

It can be written as a sum of positive squares in 10 ways, for example, as 167838521761 + 4297851364 = 409681^2 + 65558^2 .

It is not a de Polignac number, because 172136373125 - 2² = 172136373121 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172136373121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 3333134 + ... + 3384383.

Almost surely, 2^172136373125 is an apocalyptic number.

It is an amenable number.

172136373125 is a deficient number, since it is larger than the sum of its proper divisors (48211652311).

172136373125 is an frugal number, since it uses more digits than its factorization.

172136373125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6717578 (or 6717563 counting only the distinct ones).

The product of its digits is 158760, while the sum is 41.

The spelling of 172136373125 in words is "one hundred seventy-two billion, one hundred thirty-six million, three hundred seventy-three thousand, one hundred twenty-five".