51086518040621 has 24 divisors (see below), whose sum is σ = 59449076963640. Its totient is φ = 43772308070400.

The previous prime is 51086518040603. The next prime is 51086518040633. The reversal of 51086518040621 is 12604081568015.

It can be written as a sum of positive squares in 4 ways, for example, as 30250671003721 + 20835847036900 = 5500061^2 + 4564630^2 .

It is a de Polignac number, because none of the positive numbers 2^k-51086518040621 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51086518040671) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2945987411 + ... + 2946004751.

It is an arithmetic number, because the mean of its divisors is an integer number (2477044873485).

Almost surely, 2^{51086518040621} is an apocalyptic number.

It is an amenable number.

51086518040621 is a deficient number, since it is larger than the sum of its proper divisors (8362558923019).

51086518040621 is a wasteful number, since it uses less digits than its factorization.

51086518040621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36045 (or 36038 counting only the distinct ones).

The product of its (nonzero) digits is 460800, while the sum is 47.

The spelling of 51086518040621 in words is "fifty-one trillion, eighty-six billion, five hundred eighteen million, forty thousand, six hundred twenty-one".