64809189964 has 24 divisors (see below), whose sum is σ = 125308820448. Its totient is φ = 29172422400.

The previous prime is 64809189959. The next prime is 64809189983. The reversal of 64809189964 is 46998190846.

It is a super-2 number, since 2×64809189964² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 64809189896 and 64809189905.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20717487 + ... + 20720614.

It is an arithmetic number, because the mean of its divisors is an integer number (5221200852).

Almost surely, 2^64809189964 is an apocalyptic number.

It is an amenable number.

64809189964 is a deficient number, since it is larger than the sum of its proper divisors (60499630484).

64809189964 is a wasteful number, since it uses less digits than its factorization.

64809189964 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41438145 (or 41438143 counting only the distinct ones).

The product of its (nonzero) digits is 26873856, while the sum is 64.

The spelling of 64809189964 in words is "sixty-four billion, eight hundred nine million, one hundred eighty-nine thousand, nine hundred sixty-four".