51657274862521 has 8 divisors (see below), whose sum is σ = 52860608475840. Its totient is φ = 50454032232912.

The previous prime is 51657274862497. The next prime is 51657274862563. The reversal of 51657274862521 is 12526847275615.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51657274862521 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 51657274862521.

It is not an unprimeable number, because it can be changed into a prime (51657274862021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21596506 + ... + 23868883.

It is an arithmetic number, because the mean of its divisors is an integer number (6607576059480).

Almost surely, 2^{51657274862521} is an apocalyptic number.

It is an amenable number.

51657274862521 is a deficient number, since it is larger than the sum of its proper divisors (1203333613319).

51657274862521 is a wasteful number, since it uses less digits than its factorization.

51657274862521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45491855.

The product of its digits is 56448000, while the sum is 61.

The spelling of 51657274862521 in words is "fifty-one trillion, six hundred fifty-seven billion, two hundred seventy-four million, eight hundred sixty-two thousand, five hundred twenty-one".