64641663 has 12 divisors (see below), whose sum is σ = 93444000. Its totient is φ = 43060896.

The previous prime is 64641659. The next prime is 64641677. The reversal of 64641663 is 36614646.

64641663 is a `hidden beast` number, since 6 + 4 + 641 + 6 + 6 + 3 = 666.

It is not a de Polignac number, because 64641663 - 2² = 64641659 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64641653) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16195 + ... + 19787.

It is an arithmetic number, because the mean of its divisors is an integer number (7787000).

Almost surely, 2^64641663 is an apocalyptic number.

64641663 is a deficient number, since it is larger than the sum of its proper divisors (28802337).

64641663 is a wasteful number, since it uses less digits than its factorization.

64641663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5598 (or 5595 counting only the distinct ones).

The product of its digits is 62208, while the sum is 36.

The square root of 64641663 is about 8040.0039179095. The cubic root of 64641663 is about 401.3323550642.

The spelling of 64641663 in words is "sixty-four million, six hundred forty-one thousand, six hundred sixty-three".