172912787513 has 16 divisors (see below), whose sum is σ = 185924843520. Its totient is φ = 160293324816.

The previous prime is 172912787503. The next prime is 172912787527. The reversal of 172912787513 is 315787219271.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-172912787513 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (172912787503) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4950356 + ... + 4985162.

It is an arithmetic number, because the mean of its divisors is an integer number (11620302720).

Almost surely, 2^172912787513 is an apocalyptic number.

It is an amenable number.

172912787513 is a deficient number, since it is larger than the sum of its proper divisors (13012056007).

172912787513 is a wasteful number, since it uses less digits than its factorization.

172912787513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40436.

The product of its digits is 1481760, while the sum is 53.

The spelling of 172912787513 in words is "one hundred seventy-two billion, nine hundred twelve million, seven hundred eighty-seven thousand, five hundred thirteen".