64775999 has 2 divisors, whose sum is σ = 64776000. Its totient is φ = 64775998.

The previous prime is 64775993. The next prime is 64776029. The reversal of 64775999 is 99957746.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 64775999 - 2⁸ = 64775743 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64775993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32387999 + 32388000.

It is an arithmetic number, because the mean of its divisors is an integer number (32388000).

Almost surely, 2^64775999 is an apocalyptic number.

64775999 is a deficient number, since it is larger than the sum of its proper divisors (1).

64775999 is an equidigital number, since it uses as much as digits as its factorization.

64775999 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4286520, while the sum is 56.

The square root of 64775999 is about 8048.3538068353. The cubic root of 64775999 is about 401.6101742335.

The spelling of 64775999 in words is "sixty-four million, seven hundred seventy-five thousand, nine hundred ninety-nine".