51221606604597 has 60 divisors (see below), whose sum is σ = 90387108830304. Its totient is φ = 28655444170080.

The previous prime is 51221606604587. The next prime is 51221606604667. The reversal of 51221606604597 is 79540660612215.

51221606604597 is a `hidden beast` number, since 5 + 1 + 2 + 21 + 6 + 0 + 6 + 604 + 5 + 9 + 7 = 666.

It is not a de Polignac number, because 51221606604597 - 2¹⁸ = 51221606342453 is a prime.

It is a super-2 number, since 2×51221606604597² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51221606604587) by changing a digit.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 169931593 + ... + 170232750.

Almost surely, 2^{51221606604597} is an apocalyptic number.

It is an amenable number.

51221606604597 is a deficient number, since it is larger than the sum of its proper divisors (39165502225707).

51221606604597 is a wasteful number, since it uses less digits than its factorization.

51221606604597 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 340164392 (or 340164370 counting only the distinct ones).

The product of its (nonzero) digits is 5443200, while the sum is 54.

The spelling of 51221606604597 in words is "fifty-one trillion, two hundred twenty-one billion, six hundred six million, six hundred four thousand, five hundred ninety-seven".