251680207220 has 48 divisors (see below), whose sum is σ = 572164604928. Its totient is φ = 92441523840.

The previous prime is 251680207159. The next prime is 251680207267. The reversal of 251680207220 is 22702086152.

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, 2484374 + ... + 2583693.

It is an arithmetic number, because the mean of its divisors is an integer number (11920095936).

Almost surely, 2^251680207220 is an apocalyptic number.

251680207220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

251680207220 is an abundant number, since it is smaller than the sum of its proper divisors (320484397708).

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

251680207220 is a wasteful number, since it uses less digits than its factorization.

251680207220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5068280 (or 5068278 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 35.

The spelling of 251680207220 in words is "two hundred fifty-one billion, six hundred eighty million, two hundred seven thousand, two hundred twenty".