64646094809 has 4 divisors (see below), whose sum is σ = 64816665360. Its totient is φ = 64475524260.

The previous prime is 64646094797. The next prime is 64646094823. The reversal of 64646094809 is 90849064646.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64646094809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64646094859) 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, 85284707 + ... + 85285464.

It is an arithmetic number, because the mean of its divisors is an integer number (16204166340).

Almost surely, 2^64646094809 is an apocalyptic number.

It is an amenable number.

64646094809 is a deficient number, since it is larger than the sum of its proper divisors (170570551).

64646094809 is a wasteful number, since it uses less digits than its factorization.

64646094809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170570550.

The product of its (nonzero) digits is 8957952, while the sum is 56.

The spelling of 64646094809 in words is "sixty-four billion, six hundred forty-six million, ninety-four thousand, eight hundred nine".