72157099156925 has 12 divisors (see below), whose sum is σ = 94738026658356. Its totient is φ = 54330051129600.

The previous prime is 72157099156921. The next prime is 72157099156927. The reversal of 72157099156925 is 52965199075127.

It can be written as a sum of positive squares in 6 ways, for example, as 9755615066404 + 62401484090521 = 3123398^2 + 7899461^2 .

It is not a de Polignac number, because 72157099156925 - 2² = 72157099156921 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72157099156921) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 84890704466 + ... + 84890705315.

It is an arithmetic number, because the mean of its divisors is an integer number (7894835554863).

Almost surely, 2^{72157099156925} is an apocalyptic number.

It is an amenable number.

72157099156925 is a deficient number, since it is larger than the sum of its proper divisors (22580927501431).

72157099156925 is a wasteful number, since it uses less digits than its factorization.

72157099156925 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 169781409808 (or 169781409803 counting only the distinct ones).

The product of its (nonzero) digits is 107163000, while the sum is 68.

The spelling of 72157099156925 in words is "seventy-two trillion, one hundred fifty-seven billion, ninety-nine million, one hundred fifty-six thousand, nine hundred twenty-five".