51242636256065 has 16 divisors (see below), whose sum is σ = 65140959472848. Its totient is φ = 38563331598336.

The previous prime is 51242636256061. The next prime is 51242636256113. The reversal of 51242636256065 is 56065263624215.

It can be written as a sum of positive squares in 8 ways, for example, as 1024678405696 + 50217957850369 = 1012264^2 + 7086463^2 .

It is a cyclic number.

It is not a de Polignac number, because 51242636256065 - 2² = 51242636256061 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51242636255998 and 51242636256016.

It is not an unprimeable number, because it can be changed into a prime (51242636256061) 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, 151073582 + ... + 151412391.

It is an arithmetic number, because the mean of its divisors is an integer number (4071309967053).

Almost surely, 2^{51242636256065} is an apocalyptic number.

It is an amenable number.

51242636256065 is a deficient number, since it is larger than the sum of its proper divisors (13898323216783).

51242636256065 is a wasteful number, since it uses less digits than its factorization.

51242636256065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 302487988.

The product of its (nonzero) digits is 15552000, while the sum is 53.

The spelling of 51242636256065 in words is "fifty-one trillion, two hundred forty-two billion, six hundred thirty-six million, two hundred fifty-six thousand, sixty-five".