51721216520760 has 64 divisors (see below), whose sum is σ = 172404055072800. Its totient is φ = 13792324405248.

The previous prime is 51721216520759. The next prime is 51721216520761. The reversal of 51721216520760 is 6702561212715.

51721216520760 is a `hidden beast` number, since 5 + 17 + 21 + 21 + 6 + 520 + 76 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (51721216520759) and next prime (51721216520761).

It is a super-3 number, since 3×51721216520760³ (a number of 42 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51721216520761) 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, 23945006569 + ... + 23945008728.

Almost surely, 2^{51721216520760} is an apocalyptic number.

It is an amenable number.

51721216520760 is an abundant number, since it is smaller than the sum of its proper divisors (120682838552040).

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

51721216520760 is a wasteful number, since it uses less digits than its factorization.

51721216520760 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47890015317 (or 47890015307 counting only the distinct ones).

The product of its (nonzero) digits is 352800, while the sum is 45.

The spelling of 51721216520760 in words is "fifty-one trillion, seven hundred twenty-one billion, two hundred sixteen million, five hundred twenty thousand, seven hundred sixty".