66463903839 has 4 divisors (see below), whose sum is σ = 88618538456. Its totient is φ = 44309269224.

The previous prime is 66463903799. The next prime is 66463903841. The reversal of 66463903839 is 93830936466.

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

It is not a de Polignac number, because 66463903839 - 2⁷ = 66463903711 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66463903859) 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, 11077317304 + ... + 11077317309.

It is an arithmetic number, because the mean of its divisors is an integer number (22154634614).

Almost surely, 2^66463903839 is an apocalyptic number.

66463903839 is a deficient number, since it is larger than the sum of its proper divisors (22154634617).

66463903839 is a wasteful number, since it uses less digits than its factorization.

66463903839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22154634616.

The product of its (nonzero) digits is 15116544, while the sum is 57.

The spelling of 66463903839 in words is "sixty-six billion, four hundred sixty-three million, nine hundred three thousand, eight hundred thirty-nine".