51163725636 has 27 divisors (see below), whose sum is σ = 129333959391. Its totient is φ = 17054122824.

The previous prime is 51163725631. The next prime is 51163725637. The reversal of 51163725636 is 63652736115.

The square root of 51163725636 is 226194.

It is a perfect power (a square), and thus also a powerful number.

51163725636 is a `hidden beast` number, since 5 + 1 + 1 + 6 + 3 + 7 + 2 + 5 + 636 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 51163725591 and 51163725600.

It is not an unprimeable number, because it can be changed into a prime (51163725631) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 1338315 + ... + 1376013.

Almost surely, 2^51163725636 is an apocalyptic number.

51163725636 is the 226194-th square number.

It is an amenable number.

51163725636 is an abundant number, since it is smaller than the sum of its proper divisors (78170233755).

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

51163725636 is an frugal number, since it uses more digits than its factorization.

51163725636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75408 (or 37704 counting only the distinct ones).

The product of its digits is 680400, while the sum is 45.

The spelling of 51163725636 in words is "fifty-one billion, one hundred sixty-three million, seven hundred twenty-five thousand, six hundred thirty-six".