51721216520763 has 32 divisors (see below), whose sum is σ = 72180127033344. Its totient is φ = 32880774705152.

The previous prime is 51721216520761. The next prime is 51721216520807. The reversal of 51721216520763 is 36702561212715.

It is not a de Polignac number, because 51721216520763 - 2¹ = 51721216520761 is a prime.

It is a super-3 number, since 3×51721216520763³ (a number of 42 digits) contains 333 as substring.

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 31 ways as a sum of consecutive naturals, for example, 108467395 + ... + 108943187.

It is an arithmetic number, because the mean of its divisors is an integer number (2255628969792).

Almost surely, 2^{51721216520763} is an apocalyptic number.

51721216520763 is a deficient number, since it is larger than the sum of its proper divisors (20458910512581).

51721216520763 is a wasteful number, since it uses less digits than its factorization.

51721216520763 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 480635.

The product of its (nonzero) digits is 1058400, while the sum is 48.

The spelling of 51721216520763 in words is "fifty-one trillion, seven hundred twenty-one billion, two hundred sixteen million, five hundred twenty thousand, seven hundred sixty-three".