253640645550 has 72 divisors (see below), whose sum is σ = 681519567456. Its totient is φ = 67630389120.

The previous prime is 253640645549. The next prime is 253640645591. The reversal of 253640645550 is 55546046352.

253640645550 is a `hidden beast` number, since 2 + 5 + 36 + 4 + 0 + 64 + 5 + 550 = 666.

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

It is a junction number, because it is equal to n+sod(n) for n = 253640645496 and 253640645505.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 5325442 + ... + 5372858.

It is an arithmetic number, because the mean of its divisors is an integer number (9465549548).

Almost surely, 2^253640645550 is an apocalyptic number.

253640645550 is an abundant number, since it is smaller than the sum of its proper divisors (427878921906).

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

253640645550 is a wasteful number, since it uses less digits than its factorization.

253640645550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59322 (or 59314 counting only the distinct ones).

The product of its (nonzero) digits is 2160000, while the sum is 45.

The spelling of 253640645550 in words is "two hundred fifty-three billion, six hundred forty million, six hundred forty-five thousand, five hundred fifty".