51621170757 has 8 divisors (see below), whose sum is σ = 74122706784. Its totient is φ = 31766874288.

The previous prime is 51621170743. The next prime is 51621170773. The reversal of 51621170757 is 75707112615.

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

It is not a de Polignac number, because 51621170757 - 2⁶ = 51621170693 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51621170257) 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, 661809843 + ... + 661809920.

It is an arithmetic number, because the mean of its divisors is an integer number (9265338348).

Almost surely, 2^51621170757 is an apocalyptic number.

It is an amenable number.

51621170757 is a deficient number, since it is larger than the sum of its proper divisors (22501536027).

51621170757 is a wasteful number, since it uses less digits than its factorization.

51621170757 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1323619779.

The product of its (nonzero) digits is 102900, while the sum is 42.

The spelling of 51621170757 in words is "fifty-one billion, six hundred twenty-one million, one hundred seventy thousand, seven hundred fifty-seven".