64639625019 has 8 divisors (see below), whose sum is σ = 86497309200. Its totient is φ = 42937512096.

The previous prime is 64639625009. The next prime is 64639625033. The reversal of 64639625019 is 91052693646.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 64639625019 - 2⁴ = 64639625003 is a prime.

It is a super-2 number, since 2×64639625019² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (64639625009) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38891844 + ... + 38893505.

It is an arithmetic number, because the mean of its divisors is an integer number (10812163650).

Almost surely, 2^64639625019 is an apocalyptic number.

64639625019 is a deficient number, since it is larger than the sum of its proper divisors (21857684181).

64639625019 is a wasteful number, since it uses less digits than its factorization.

64639625019 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77785629.

The product of its (nonzero) digits is 2099520, while the sum is 51.

The spelling of 64639625019 in words is "sixty-four billion, six hundred thirty-nine million, six hundred twenty-five thousand, nineteen".