63939666 has 32 divisors (see below), whose sum is σ = 147604608. Its totient is φ = 18086400.

The previous prime is 63939661. The next prime is 63939679. The reversal of 63939666 is 66693936.

It is not an unprimeable number, because it can be changed into a prime (63939661) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3295 + ... + 11778.

It is an arithmetic number, because the mean of its divisors is an integer number (4612644).

Almost surely, 2^63939666 is an apocalyptic number.

63939666 is an abundant number, since it is smaller than the sum of its proper divisors (83664942).

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

63939666 is a wasteful number, since it uses less digits than its factorization.

63939666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15186.

The product of its digits is 944784, while the sum is 48.

The square root of 63939666 is about 7996.2282358622. The cubic root of 63939666 is about 399.8742646474.

The spelling of 63939666 in words is "sixty-three million, nine hundred thirty-nine thousand, six hundred sixty-six".