664353053762557 has 4 divisors (see below), whose sum is σ = 665300775665916. Its totient is φ = 663405331859200.

The previous prime is 664353053762537. The next prime is 664353053762561. The reversal of 664353053762557 is 755267350353466.

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 618362019336996 + 45991034425561 = 24866886^2 + 6781669^2 .

It is a cyclic number.

It is not a de Polignac number, because 664353053762557 - 2¹⁵ = 664353053729789 is a prime.

It is a Smith number, since the sum of its digits (67) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 664353053762492 and 664353053762501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664353053762527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 473860950628 + ... + 473860952029.

It is an arithmetic number, because the mean of its divisors is an integer number (166325193916479).

Almost surely, 2^{664353053762557} is an apocalyptic number.

It is an amenable number.

664353053762557 is a deficient number, since it is larger than the sum of its proper divisors (947721903359).

664353053762557 is an equidigital number, since it uses as much as digits as its factorization.

664353053762557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 947721903358.

The product of its (nonzero) digits is 1428840000, while the sum is 67.

The spelling of 664353053762557 in words is "six hundred sixty-four trillion, three hundred fifty-three billion, fifty-three million, seven hundred sixty-two thousand, five hundred fifty-seven".