253944738520 has 64 divisors (see below), whose sum is σ = 624346444800. Its totient is φ = 92191313280.

The previous prime is 253944738497. The next prime is 253944738539. The reversal of 253944738520 is 25837449352.

It is a happy number.

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, 208330 + ... + 742489.

It is an arithmetic number, because the mean of its divisors is an integer number (9755413200).

Almost surely, 2^253944738520 is an apocalyptic number.

253944738520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

253944738520 is an abundant number, since it is smaller than the sum of its proper divisors (370401706280).

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

253944738520 is a wasteful number, since it uses less digits than its factorization.

253944738520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 951448 (or 951444 counting only the distinct ones).

The product of its (nonzero) digits is 7257600, while the sum is 52.

The spelling of 253944738520 in words is "two hundred fifty-three billion, nine hundred forty-four million, seven hundred thirty-eight thousand, five hundred twenty".