664327964109 has 16 divisors (see below), whose sum is σ = 886838827392. Its totient is φ = 442351354368.

The previous prime is 664327964089. The next prime is 664327964141. The reversal of 664327964109 is 901469723466.

It is a happy number.

It is not a de Polignac number, because 664327964109 - 2²⁰ = 664326915533 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664327964149) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23638464 + ... + 23666550.

It is an arithmetic number, because the mean of its divisors is an integer number (55427426712).

Almost surely, 2^664327964109 is an apocalyptic number.

It is an amenable number.

664327964109 is a deficient number, since it is larger than the sum of its proper divisors (222510863283).

664327964109 is a wasteful number, since it uses less digits than its factorization.

664327964109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37316.

The product of its (nonzero) digits is 11757312, while the sum is 57.

The spelling of 664327964109 in words is "six hundred sixty-four billion, three hundred twenty-seven million, nine hundred sixty-four thousand, one hundred nine".