63399965 has 16 divisors (see below), whose sum is σ = 77450688. Its totient is φ = 49814016.

The previous prime is 63399943. The next prime is 63399971. The reversal of 63399965 is 56999336.

It is a cyclic number.

It is not a de Polignac number, because 63399965 - 2¹⁸ = 63137821 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 93869 + ... + 94541.

It is an arithmetic number, because the mean of its divisors is an integer number (4840668).

Almost surely, 2^63399965 is an apocalyptic number.

It is an amenable number.

63399965 is a deficient number, since it is larger than the sum of its proper divisors (14050723).

63399965 is a wasteful number, since it uses less digits than its factorization.

63399965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 988.

The product of its digits is 1180980, while the sum is 50.

The square root of 63399965 is about 7962.4094971309. The cubic root of 63399965 is about 398.7459999009.

The spelling of 63399965 in words is "sixty-three million, three hundred ninety-nine thousand, nine hundred sixty-five".