51630802561 has 16 divisors (see below), whose sum is σ = 59092059600. Its totient is φ = 44688918528.

The previous prime is 51630802549. The next prime is 51630802567. The reversal of 51630802561 is 16520803615.

It can be written as a sum of positive squares in 8 ways, for example, as 2836201536 + 48794601025 = 53256^2 + 220895^2 .

It is a cyclic number.

It is not a de Polignac number, because 51630802561 - 2⁹ = 51630802049 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 51630802561.

It is not an unprimeable number, because it can be changed into a prime (51630802567) 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, 374796 + ... + 493693.

It is an arithmetic number, because the mean of its divisors is an integer number (3693253725).

Almost surely, 2^51630802561 is an apocalyptic number.

It is an amenable number.

51630802561 is a deficient number, since it is larger than the sum of its proper divisors (7461257039).

51630802561 is a wasteful number, since it uses less digits than its factorization.

51630802561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 868788.

The product of its (nonzero) digits is 43200, while the sum is 37.

The spelling of 51630802561 in words is "fifty-one billion, six hundred thirty million, eight hundred two thousand, five hundred sixty-one".