251566503240063 has 16 divisors (see below), whose sum is σ = 365946186471552. Its totient is φ = 152451517140000.

The previous prime is 251566503239951. The next prime is 251566503240097. The reversal of 251566503240063 is 360042305665152.

It is a happy number.

It is not a de Polignac number, because 251566503240063 - 2²⁵ = 251566469685631 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 251566503239994 and 251566503240021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (251566503240863) 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, 325364973 + ... + 326137238.

It is an arithmetic number, because the mean of its divisors is an integer number (22871636654472).

Almost surely, 2^{251566503240063} is an apocalyptic number.

251566503240063 is a deficient number, since it is larger than the sum of its proper divisors (114379683231489).

251566503240063 is a wasteful number, since it uses less digits than its factorization.

251566503240063 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 651513926.

The product of its (nonzero) digits is 3888000, while the sum is 48.

The spelling of 251566503240063 in words is "two hundred fifty-one trillion, five hundred sixty-six billion, five hundred three million, two hundred forty thousand, sixty-three".