51211624020637 has 2 divisors, whose sum is σ = 51211624020638. Its totient is φ = 51211624020636.

The previous prime is 51211624020631. The next prime is 51211624020653. The reversal of 51211624020637 is 73602042611215.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27444302490361 + 23767321530276 = 5238731^2 + 4875174^2 .

It is a cyclic number.

It is not a de Polignac number, because 51211624020637 - 2¹⁵ = 51211623987869 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51211624020637.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51211624020631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25605812010318 + 25605812010319.

It is an arithmetic number, because the mean of its divisors is an integer number (25605812010319).

Almost surely, 2^{51211624020637} is an apocalyptic number.

It is an amenable number.

51211624020637 is a deficient number, since it is larger than the sum of its proper divisors (1).

51211624020637 is an equidigital number, since it uses as much as digits as its factorization.

51211624020637 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 120960, while the sum is 40.

The spelling of 51211624020637 in words is "fifty-one trillion, two hundred eleven billion, six hundred twenty-four million, twenty thousand, six hundred thirty-seven".