664633557457 has 8 divisors (see below), whose sum is σ = 693859775400. Its totient is φ = 635827860864.

The previous prime is 664633557451. The next prime is 664633557461. The reversal of 664633557457 is 754755336466.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 10490675776 + 654142881681 = 102424^2 + 808791^2 .

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 664633557457 - 2³ = 664633557449 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 664633557395 and 664633557404.

It is not an unprimeable number, because it can be changed into a prime (664633557451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 105127108 + ... + 105133429.

It is an arithmetic number, because the mean of its divisors is an integer number (86732471925).

Almost surely, 2^664633557457 is an apocalyptic number.

It is an amenable number.

664633557457 is a deficient number, since it is larger than the sum of its proper divisors (29226217943).

664633557457 is a wasteful number, since it uses less digits than its factorization.

664633557457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 210260675.

The product of its digits is 190512000, while the sum is 61.

The spelling of 664633557457 in words is "six hundred sixty-four billion, six hundred thirty-three million, five hundred fifty-seven thousand, four hundred fifty-seven".