253661864 has 16 divisors (see below), whose sum is σ = 476068320. Its totient is φ = 126710320.

The previous prime is 253661813. The next prime is 253661873. The reversal of 253661864 is 468166352.

253661864 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5804 + ... + 23259.

It is an arithmetic number, because the mean of its divisors is an integer number (29754270).

Almost surely, 2^253661864 is an apocalyptic number.

It is an amenable number.

253661864 is a deficient number, since it is larger than the sum of its proper divisors (222406456).

253661864 is a wasteful number, since it uses less digits than its factorization.

253661864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30160 (or 30156 counting only the distinct ones).

The product of its digits is 207360, while the sum is 41.

The square root of 253661864 is about 15926.7656478018. The cubic root of 253661864 is about 633.0214015776.

The spelling of 253661864 in words is "two hundred fifty-three million, six hundred sixty-one thousand, eight hundred sixty-four".