251522251045 has 16 divisors (see below), whose sum is σ = 325491304320. Its totient is φ = 185483985984.

The previous prime is 251522251039. The next prime is 251522251063. The reversal of 251522251045 is 540152225152.

It is a cyclic number.

It is not a de Polignac number, because 251522251045 - 2³ = 251522251037 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 251522251045.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2614075 + ... + 2708584.

It is an arithmetic number, because the mean of its divisors is an integer number (20343206520).

Almost surely, 2^251522251045 is an apocalyptic number.

It is an amenable number.

251522251045 is a deficient number, since it is larger than the sum of its proper divisors (73969053275).

251522251045 is a wasteful number, since it uses less digits than its factorization.

251522251045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5323404.

The product of its (nonzero) digits is 40000, while the sum is 34.

Adding to 251522251045 its reverse (540152225152), we get a palindrome (791674476197).

The spelling of 251522251045 in words is "two hundred fifty-one billion, five hundred twenty-two million, two hundred fifty-one thousand, forty-five".