664213678087 has 4 divisors (see below), whose sum is σ = 693092533680. Its totient is φ = 635334822496.

The previous prime is 664213678031. The next prime is 664213678181. The reversal of 664213678087 is 780876312466.

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

It is a de Polignac number, because none of the positive numbers 2^k-664213678087 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664213678487) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14439427762 + ... + 14439427807.

It is an arithmetic number, because the mean of its divisors is an integer number (173273133420).

Almost surely, 2^664213678087 is an apocalyptic number.

664213678087 is a deficient number, since it is larger than the sum of its proper divisors (28878855593).

664213678087 is a wasteful number, since it uses less digits than its factorization.

664213678087 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28878855592.

The product of its (nonzero) digits is 16257024, while the sum is 58.

The spelling of 664213678087 in words is "six hundred sixty-four billion, two hundred thirteen million, six hundred seventy-eight thousand, eighty-seven".