64686670607998 has 4 divisors (see below), whose sum is σ = 97030005912000. Its totient is φ = 32343335303998.

The previous prime is 64686670607963. The next prime is 64686670608013. The reversal of 64686670607998 is 89970607668646.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16171667651998 + ... + 16171667652001.

It is an arithmetic number, because the mean of its divisors is an integer number (24257501478000).

Almost surely, 2^{64686670607998} is an apocalyptic number.

64686670607998 is a deficient number, since it is larger than the sum of its proper divisors (32343335304002).

64686670607998 is a wasteful number, since it uses less digits than its factorization.

64686670607998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32343335304001.

The product of its (nonzero) digits is 7900913664, while the sum is 82.

The spelling of 64686670607998 in words is "sixty-four trillion, six hundred eighty-six billion, six hundred seventy million, six hundred seven thousand, nine hundred ninety-eight".