51212500052661 has 48 divisors (see below), whose sum is σ = 76699184540160. Its totient is φ = 32893520273280.

The previous prime is 51212500052639. The next prime is 51212500052669. The reversal of 51212500052661 is 16625000521215.

51212500052661 is a `hidden beast` number, since 5 + 1 + 2 + 125 + 0 + 0 + 0 + 526 + 6 + 1 = 666.

It is not a de Polignac number, because 51212500052661 - 2²⁶ = 51212432943797 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51212500052669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1200937806 + ... + 1200980448.

It is an arithmetic number, because the mean of its divisors is an integer number (1597899677920).

Almost surely, 2^{51212500052661} is an apocalyptic number.

It is an amenable number.

51212500052661 is a deficient number, since it is larger than the sum of its proper divisors (25486684487499).

51212500052661 is a wasteful number, since it uses less digits than its factorization.

51212500052661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61706 (or 61703 counting only the distinct ones).

The product of its (nonzero) digits is 36000, while the sum is 36.

Adding to 51212500052661 its reverse (16625000521215), we get a palindrome (67837500573876).

The spelling of 51212500052661 in words is "fifty-one trillion, two hundred twelve billion, five hundred million, fifty-two thousand, six hundred sixty-one".