51657257225 has 24 divisors (see below), whose sum is σ = 73374887040. Its totient is φ = 35340261120.

The previous prime is 51657257203. The next prime is 51657257251. The reversal of 51657257225 is 52275275615.

It is not a de Polignac number, because 51657257225 - 2⁸ = 51657256969 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51657257225.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 265085 + ... + 416634.

It is an arithmetic number, because the mean of its divisors is an integer number (3057286960).

Almost surely, 2^51657257225 is an apocalyptic number.

It is an amenable number.

51657257225 is a deficient number, since it is larger than the sum of its proper divisors (21717629815).

51657257225 is a wasteful number, since it uses less digits than its factorization.

51657257225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 682169 (or 682164 counting only the distinct ones).

The product of its digits is 1470000, while the sum is 47.

The spelling of 51657257225 in words is "fifty-one billion, six hundred fifty-seven million, two hundred fifty-seven thousand, two hundred twenty-five".