64875991 has 2 divisors, whose sum is σ = 64875992. Its totient is φ = 64875990.

The previous prime is 64875983. The next prime is 64875997. The reversal of 64875991 is 19957846.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 64875991 - 2³ = 64875983 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64875997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32437995 + 32437996.

It is an arithmetic number, because the mean of its divisors is an integer number (32437996).

Almost surely, 2^64875991 is an apocalyptic number.

64875991 is a deficient number, since it is larger than the sum of its proper divisors (1).

64875991 is an equidigital number, since it uses as much as digits as its factorization.

64875991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 544320, while the sum is 49.

The square root of 64875991 is about 8054.5633649503. The cubic root of 64875991 is about 401.8167176012.

The spelling of 64875991 in words is "sixty-four million, eight hundred seventy-five thousand, nine hundred ninety-one".