251552747240220 has 96 divisors (see below), whose sum is σ = 707404350643200. Its totient is φ = 66789709265664.

The previous prime is 251552747240191. The next prime is 251552747240231. The reversal of 251552747240220 is 22042747255152.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 251552747240220.

It is a congruent number.

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, 91409607 + ... + 94121313.

It is an arithmetic number, because the mean of its divisors is an integer number (7368795319200).

Almost surely, 2^{251552747240220} is an apocalyptic number.

251552747240220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

251552747240220 is an abundant number, since it is smaller than the sum of its proper divisors (455851603402980).

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

251552747240220 is a wasteful number, since it uses less digits than its factorization.

251552747240220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2718427 (or 2718425 counting only the distinct ones).

The product of its (nonzero) digits is 3136000, while the sum is 48.

The spelling of 251552747240220 in words is "two hundred fifty-one trillion, five hundred fifty-two billion, seven hundred forty-seven million, two hundred forty thousand, two hundred twenty".