663690538 has 16 divisors (see below), whose sum is σ = 1138927104. Its totient is φ = 284145840.

The previous prime is 663690529. The next prime is 663690611. The reversal of 663690538 is 835096366.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10045 + ... + 37792.

It is an arithmetic number, because the mean of its divisors is an integer number (71182944).

Almost surely, 2^663690538 is an apocalyptic number.

663690538 is a deficient number, since it is larger than the sum of its proper divisors (475236566).

663690538 is a wasteful number, since it uses less digits than its factorization.

663690538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48837.

The product of its (nonzero) digits is 699840, while the sum is 46.

The square root of 663690538 is about 25762.1920263009. The cubic root of 663690538 is about 872.2785815924.

The spelling of 663690538 in words is "six hundred sixty-three million, six hundred ninety thousand, five hundred thirty-eight".