251225943930 has 64 divisors (see below), whose sum is σ = 721469387520. Its totient is φ = 61840231488.

The previous prime is 251225943929. The next prime is 251225944001. The reversal of 251225943930 is 39349522152.

251225943930 is a `hidden beast` number, since 2 + 5 + 1 + 2 + 259 + 4 + 393 + 0 = 666.

It is a super-2 number, since 2×251225943930² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 35783662 + ... + 35790681.

It is an arithmetic number, because the mean of its divisors is an integer number (11272959180).

Almost surely, 2^251225943930 is an apocalyptic number.

251225943930 is an abundant number, since it is smaller than the sum of its proper divisors (470243443590).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

251225943930 is a wasteful number, since it uses less digits than its factorization.

251225943930 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71574372 (or 71574366 counting only the distinct ones).

The product of its (nonzero) digits is 583200, while the sum is 45.

The spelling of 251225943930 in words is "two hundred fifty-one billion, two hundred twenty-five million, nine hundred forty-three thousand, nine hundred thirty".