664784840795 has 8 divisors (see below), whose sum is σ = 844667797824. Its totient is φ = 500543880064.

The previous prime is 664784840749. The next prime is 664784840803. The reversal of 664784840795 is 597048487466.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 664784840795 - 2¹² = 664784836699 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3910498979 + ... + 3910499148.

It is an arithmetic number, because the mean of its divisors is an integer number (105583474728).

Almost surely, 2^664784840795 is an apocalyptic number.

664784840795 is a deficient number, since it is larger than the sum of its proper divisors (179882957029).

664784840795 is a wasteful number, since it uses less digits than its factorization.

664784840795 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7820998149.

The product of its (nonzero) digits is 325140480, while the sum is 68.

The spelling of 664784840795 in words is "six hundred sixty-four billion, seven hundred eighty-four million, eight hundred forty thousand, seven hundred ninety-five".