664476225601 has 4 divisors (see below), whose sum is σ = 665052528772. Its totient is φ = 663899922432.

The previous prime is 664476225557. The next prime is 664476225607. The reversal of 664476225601 is 106522674466.

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

It can be written as a sum of positive squares in 2 ways, for example, as 620945576001 + 43530649600 = 788001^2 + 208640^2 .

It is a cyclic number.

It is not a de Polignac number, because 664476225601 - 2⁷ = 664476225473 is a prime.

It is a super-2 number, since 2×664476225601² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (664476225607) 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 3 ways as a sum of consecutive naturals, for example, 288149856 + ... + 288152161.

It is an arithmetic number, because the mean of its divisors is an integer number (166263132193).

Almost surely, 2^664476225601 is an apocalyptic number.

It is an amenable number.

664476225601 is a deficient number, since it is larger than the sum of its proper divisors (576303171).

664476225601 is a wasteful number, since it uses less digits than its factorization.

664476225601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 576303170.

The product of its (nonzero) digits is 2903040, while the sum is 49.

The spelling of 664476225601 in words is "six hundred sixty-four billion, four hundred seventy-six million, two hundred twenty-five thousand, six hundred one".