664933280257 has 4 divisors (see below), whose sum is σ = 665022099456. Its totient is φ = 664844461060.

The previous prime is 664933280233. The next prime is 664933280321. The reversal of 664933280257 is 752082339466.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 664933280257 - 2¹¹ = 664933278209 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 664933280198 and 664933280207.

It is not an unprimeable number, because it can be changed into a prime (664933280357) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 44398369 + ... + 44413342.

It is an arithmetic number, because the mean of its divisors is an integer number (166255524864).

Almost surely, 2^664933280257 is an apocalyptic number.

It is an amenable number.

664933280257 is a deficient number, since it is larger than the sum of its proper divisors (88819199).

664933280257 is an equidigital number, since it uses as much as digits as its factorization.

664933280257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88819198.

The product of its (nonzero) digits is 13063680, while the sum is 55.

The spelling of 664933280257 in words is "six hundred sixty-four billion, nine hundred thirty-three million, two hundred eighty thousand, two hundred fifty-seven".