64398645686 has 4 divisors (see below), whose sum is σ = 96597968532. Its totient is φ = 32199322842.

The previous prime is 64398645679. The next prime is 64398645769. The reversal of 64398645686 is 68654689346.

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

It is a Curzon number.

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, 16099661420 + ... + 16099661423.

It is an arithmetic number, because the mean of its divisors is an integer number (24149492133).

Almost surely, 2^64398645686 is an apocalyptic number.

64398645686 is a deficient number, since it is larger than the sum of its proper divisors (32199322846).

64398645686 is a wasteful number, since it uses less digits than its factorization.

64398645686 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32199322845.

The product of its digits is 179159040, while the sum is 65.

The spelling of 64398645686 in words is "sixty-four billion, three hundred ninety-eight million, six hundred forty-five thousand, six hundred eighty-six".