64400663 has 2 divisors, whose sum is σ = 64400664. Its totient is φ = 64400662.

The previous prime is 64400659. The next prime is 64400717. The reversal of 64400663 is 36600446.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 64400663 - 2² = 64400659 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64400603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32200331 + 32200332.

It is an arithmetic number, because the mean of its divisors is an integer number (32200332).

Almost surely, 2^64400663 is an apocalyptic number.

64400663 is a deficient number, since it is larger than the sum of its proper divisors (1).

64400663 is an equidigital number, since it uses as much as digits as its factorization.

64400663 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10368, while the sum is 29.

The square root of 64400663 is about 8025.0023676009. The cubic root of 64400663 is about 400.8329787453.

The spelling of 64400663 in words is "sixty-four million, four hundred thousand, six hundred sixty-three".