64188939239999 has 64 divisors (see below), whose sum is σ = 77434283888640. Its totient is φ = 52046972651520.

The previous prime is 64188939239959. The next prime is 64188939240001. The reversal of 64188939239999 is 99993293988146.

It is a Cunningham number, because it is equal to 8011800²-1.

It is not a de Polignac number, because 64188939239999 - 2¹² = 64188939235903 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64188939239939) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3469100582 + ... + 3469119084.

It is an arithmetic number, because the mean of its divisors is an integer number (1209910685760).

Almost surely, 2^{64188939239999} is an apocalyptic number.

64188939239999 is a deficient number, since it is larger than the sum of its proper divisors (13245344648641).

64188939239999 is a wasteful number, since it uses less digits than its factorization.

64188939239999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19680.

The product of its digits is 14693280768, while the sum is 89.

The spelling of 64188939239999 in words is "sixty-four trillion, one hundred eighty-eight billion, nine hundred thirty-nine million, two hundred thirty-nine thousand, nine hundred ninety-nine".