64239363899 has 4 divisors (see below), whose sum is σ = 64250757480. Its totient is φ = 64227970320.

The previous prime is 64239363847. The next prime is 64239363913. The reversal of 64239363899 is 99836393246.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64239363899 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64239366899) 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, 5688329 + ... + 5699610.

It is an arithmetic number, because the mean of its divisors is an integer number (16062689370).

Almost surely, 2^64239363899 is an apocalyptic number.

64239363899 is a deficient number, since it is larger than the sum of its proper divisors (11393581).

64239363899 is a wasteful number, since it uses less digits than its factorization.

64239363899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11393580.

The product of its digits is 45349632, while the sum is 62.

The spelling of 64239363899 in words is "sixty-four billion, two hundred thirty-nine million, three hundred sixty-three thousand, eight hundred ninety-nine".