251320623225 has 48 divisors (see below), whose sum is σ = 474923412480. Its totient is φ = 114878030400.

The previous prime is 251320623167. The next prime is 251320623269. The reversal of 251320623225 is 522326023152.

It is not a de Polignac number, because 251320623225 - 2¹⁵ = 251320590457 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 7605990 + ... + 7638960.

It is an arithmetic number, because the mean of its divisors is an integer number (9894237760).

Almost surely, 2^251320623225 is an apocalyptic number.

251320623225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

251320623225 is a deficient number, since it is larger than the sum of its proper divisors (223602789255).

251320623225 is a wasteful number, since it uses less digits than its factorization.

251320623225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47510 (or 47505 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 33.

Adding to 251320623225 its reverse (522326023152), we get a palindrome (773646646377).

The spelling of 251320623225 in words is "two hundred fifty-one billion, three hundred twenty million, six hundred twenty-three thousand, two hundred twenty-five".