64618399 has 2 divisors, whose sum is σ = 64618400. Its totient is φ = 64618398.

The previous prime is 64618381. The next prime is 64618403. The reversal of 64618399 is 99381646.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 64618399 - 2⁷ = 64618271 is a 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 (64612399) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32309199 + 32309200.

It is an arithmetic number, because the mean of its divisors is an integer number (32309200).

Almost surely, 2^64618399 is an apocalyptic number.

64618399 is a deficient number, since it is larger than the sum of its proper divisors (1).

64618399 is an equidigital number, since it uses as much as digits as its factorization.

64618399 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 279936, while the sum is 46.

The square root of 64618399 is about 8038.5570222522. The cubic root of 64618399 is about 401.2842038887.

The spelling of 64618399 in words is "sixty-four million, six hundred eighteen thousand, three hundred ninety-nine".