664786804553 has 16 divisors (see below), whose sum is σ = 730259712000. Its totient is φ = 602366743440.

The previous prime is 664786804543. The next prime is 664786804579. The reversal of 664786804553 is 355408687466.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-664786804553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (664786804543) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6033248 + ... + 6142446.

It is an arithmetic number, because the mean of its divisors is an integer number (45641232000).

Almost surely, 2^664786804553 is an apocalyptic number.

It is an amenable number.

664786804553 is a deficient number, since it is larger than the sum of its proper divisors (65472907447).

664786804553 is a wasteful number, since it uses less digits than its factorization.

664786804553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123172.

The product of its (nonzero) digits is 116121600, while the sum is 62.

The spelling of 664786804553 in words is "six hundred sixty-four billion, seven hundred eighty-six million, eight hundred four thousand, five hundred fifty-three".