64311320499 has 4 divisors (see below), whose sum is σ = 85748427336. Its totient is φ = 42874213664.

The previous prime is 64311320477. The next prime is 64311320509. The reversal of 64311320499 is 99402311346.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 64311320499 - 2⁷ = 64311320371 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 64311320499.

It is not an unprimeable number, because it can be changed into a prime (64311320419) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10718553414 + ... + 10718553419.

It is an arithmetic number, because the mean of its divisors is an integer number (21437106834).

Almost surely, 2^64311320499 is an apocalyptic number.

64311320499 is a deficient number, since it is larger than the sum of its proper divisors (21437106837).

64311320499 is a wasteful number, since it uses less digits than its factorization.

64311320499 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21437106836.

The product of its (nonzero) digits is 139968, while the sum is 42.

The spelling of 64311320499 in words is "sixty-four billion, three hundred eleven million, three hundred twenty thousand, four hundred ninety-nine".