664733504124217 has 4 divisors (see below), whose sum is σ = 725163822680976. Its totient is φ = 604303185567460.

The previous prime is 664733504124203. The next prime is 664733504124223. The reversal of 664733504124217 is 712421405337466.

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 a de Polignac number, because none of the positive numbers 2^k-664733504124217 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (664733504124017) 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, 30215159278363 + ... + 30215159278384.

It is an arithmetic number, because the mean of its divisors is an integer number (181290955670244).

Almost surely, 2^{664733504124217} is an apocalyptic number.

It is an amenable number.

664733504124217 is a deficient number, since it is larger than the sum of its proper divisors (60430318556759).

664733504124217 is a wasteful number, since it uses less digits than its factorization.

664733504124217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60430318556758.

The product of its (nonzero) digits is 20321280, while the sum is 55.

The spelling of 664733504124217 in words is "six hundred sixty-four trillion, seven hundred thirty-three billion, five hundred four million, one hundred twenty-four thousand, two hundred seventeen".