64439324117 has 32 divisors (see below), whose sum is σ = 75215831040. Its totient is φ = 54070248960.

The previous prime is 64439324093. The next prime is 64439324123. The reversal of 64439324117 is 71142393446.

It is not a de Polignac number, because 64439324117 - 2¹⁰ = 64439323093 is a prime.

It is a super-5 number, since 5×64439324117⁵ (a number of 55 digits) contains 55555 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64439329117) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 30964517 + ... + 30966597.

It is an arithmetic number, because the mean of its divisors is an integer number (2350494720).

Almost surely, 2^64439324117 is an apocalyptic number.

It is an amenable number.

64439324117 is a deficient number, since it is larger than the sum of its proper divisors (10776506923).

64439324117 is a wasteful number, since it uses less digits than its factorization.

64439324117 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2633.

The product of its digits is 435456, while the sum is 44.

The spelling of 64439324117 in words is "sixty-four billion, four hundred thirty-nine million, three hundred twenty-four thousand, one hundred seventeen".