251235052215 has 64 divisors (see below), whose sum is σ = 484476195840. Its totient is φ = 108603970560.

The previous prime is 251235052207. The next prime is 251235052259. The reversal of 251235052215 is 512250532152.

It is not a de Polignac number, because 251235052215 - 2³ = 251235052207 is a prime.

It is a super-2 number, since 2×251235052215² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 962907 + ... + 1195683.

It is an arithmetic number, because the mean of its divisors is an integer number (7569940560).

Almost surely, 2^251235052215 is an apocalyptic number.

251235052215 is a deficient number, since it is larger than the sum of its proper divisors (233241143625).

251235052215 is a wasteful number, since it uses less digits than its factorization.

251235052215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 233352.

The product of its (nonzero) digits is 30000, while the sum is 33.

Adding to 251235052215 its reverse (512250532152), we get a palindrome (763485584367).

The spelling of 251235052215 in words is "two hundred fifty-one billion, two hundred thirty-five million, fifty-two thousand, two hundred fifteen".