64066884639 has 4 divisors (see below), whose sum is σ = 85422512856. Its totient is φ = 42711256424.

The previous prime is 64066884631. The next prime is 64066884647. The reversal of 64066884639 is 93648866046.

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

It is an interprime number because it is at equal distance from previous prime (64066884631) and next prime (64066884647).

It is a cyclic number.

It is not a de Polignac number, because 64066884639 - 2³ = 64066884631 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64066884631) 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, 10677814104 + ... + 10677814109.

It is an arithmetic number, because the mean of its divisors is an integer number (21355628214).

Almost surely, 2^64066884639 is an apocalyptic number.

64066884639 is a deficient number, since it is larger than the sum of its proper divisors (21355628217).

64066884639 is a wasteful number, since it uses less digits than its factorization.

64066884639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21355628216.

The product of its (nonzero) digits is 35831808, while the sum is 60.

The spelling of 64066884639 in words is "sixty-four billion, sixty-six million, eight hundred eighty-four thousand, six hundred thirty-nine".