664841554015 has 16 divisors (see below), whose sum is σ = 807532413408. Its totient is φ = 525393296896.

The previous prime is 664841554001. The next prime is 664841554021. The reversal of 664841554015 is 510455148466.

664841554015 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 664841554015 - 2²⁹ = 664304683103 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 664841554015.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3038739 + ... + 3250171.

It is an arithmetic number, because the mean of its divisors is an integer number (50470775838).

Almost surely, 2^664841554015 is an apocalyptic number.

664841554015 is a deficient number, since it is larger than the sum of its proper divisors (142690859393).

664841554015 is a wasteful number, since it uses less digits than its factorization.

664841554015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 219098.

The product of its (nonzero) digits is 2304000, while the sum is 49.

The spelling of 664841554015 in words is "six hundred sixty-four billion, eight hundred forty-one million, five hundred fifty-four thousand, fifteen".