64379561399 has 2 divisors, whose sum is σ = 64379561400. Its totient is φ = 64379561398.

The previous prime is 64379561387. The next prime is 64379561423. The reversal of 64379561399 is 99316597346.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 64379561399 - 2²⁰ = 64378512823 is a prime.

It is a super-2 number, since 2×64379561399² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64379561329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32189780699 + 32189780700.

It is an arithmetic number, because the mean of its divisors is an integer number (32189780700).

Almost surely, 2^64379561399 is an apocalyptic number.

64379561399 is a deficient number, since it is larger than the sum of its proper divisors (1).

64379561399 is an equidigital number, since it uses as much as digits as its factorization.

64379561399 is an evil number, because the sum of its binary digits is even.

The product of its digits is 33067440, while the sum is 62.

The spelling of 64379561399 in words is "sixty-four billion, three hundred seventy-nine million, five hundred sixty-one thousand, three hundred ninety-nine".