251205231560 has 32 divisors (see below), whose sum is σ = 565256396160. Its totient is φ = 100474159296.

The previous prime is 251205231493. The next prime is 251205231569. The reversal of 251205231560 is 65132502152.

It is a super-2 number, since 2×251205231560² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (251205231569) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 278867 + ... + 761693.

It is an arithmetic number, because the mean of its divisors is an integer number (17664262380).

Almost surely, 2^251205231560 is an apocalyptic number.

251205231560 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

251205231560 is an abundant number, since it is smaller than the sum of its proper divisors (314051164600).

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

251205231560 is a wasteful number, since it uses less digits than its factorization.

251205231560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 495845 (or 495841 counting only the distinct ones).

The product of its (nonzero) digits is 18000, while the sum is 32.

The spelling of 251205231560 in words is "two hundred fifty-one billion, two hundred five million, two hundred thirty-one thousand, five hundred sixty".