51165056121621 has 16 divisors (see below), whose sum is σ = 73519041481536. Its totient is φ = 31464216130176.

The previous prime is 51165056121607. The next prime is 51165056121637. The reversal of 51165056121621 is 12612165056115.

It is not a de Polignac number, because 51165056121621 - 2⁵ = 51165056121589 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51165056921621) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 457698655 + ... + 457810428.

It is an arithmetic number, because the mean of its divisors is an integer number (4594940092596).

Almost surely, 2^{51165056121621} is an apocalyptic number.

It is an amenable number.

51165056121621 is a deficient number, since it is larger than the sum of its proper divisors (22353985359915).

51165056121621 is a wasteful number, since it uses less digits than its factorization.

51165056121621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 915510532.

The product of its (nonzero) digits is 108000, while the sum is 42.

The spelling of 51165056121621 in words is "fifty-one trillion, one hundred sixty-five billion, fifty-six million, one hundred twenty-one thousand, six hundred twenty-one".