64625399 has 2 divisors, whose sum is σ = 64625400. Its totient is φ = 64625398.

The previous prime is 64625383. The next prime is 64625401. The reversal of 64625399 is 99352646.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 64625399 - 2⁴ = 64625383 is a prime.

Together with 64625401, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64625299) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32312699 + 32312700.

It is an arithmetic number, because the mean of its divisors is an integer number (32312700).

Almost surely, 2^64625399 is an apocalyptic number.

64625399 is a deficient number, since it is larger than the sum of its proper divisors (1).

64625399 is an equidigital number, since it uses as much as digits as its factorization.

64625399 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 349920, while the sum is 44.

The square root of 64625399 is about 8038.9924119880. The cubic root of 64625399 is about 401.2986935080.

The spelling of 64625399 in words is "sixty-four million, six hundred twenty-five thousand, three hundred ninety-nine".