253663668 has 18 divisors (see below), whose sum is σ = 641205474. Its totient is φ = 84554544.

The previous prime is 253663649. The next prime is 253663673. The reversal of 253663668 is 866366352.

253663668 is a `hidden beast` number, since 2 + 5 + 3 + 6 + 636 + 6 + 8 = 666.

It can be written as a sum of positive squares in only one way, i.e., 251285904 + 2377764 = 15852^2 + 1542^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3523071 + ... + 3523142.

Almost surely, 2^253663668 is an apocalyptic number.

It is an amenable number.

253663668 is an abundant number, since it is smaller than the sum of its proper divisors (387541806).

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

253663668 is a wasteful number, since it uses less digits than its factorization.

253663668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7046223 (or 7046218 counting only the distinct ones).

The product of its digits is 933120, while the sum is 45.

The square root of 253663668 is about 15926.8222819243. The cubic root of 253663668 is about 633.0229022209.

The spelling of 253663668 in words is "two hundred fifty-three million, six hundred sixty-three thousand, six hundred sixty-eight".