663717554660247 has 4 divisors (see below), whose sum is σ = 884956739547000. Its totient is φ = 442478369773496.

The previous prime is 663717554660179. The next prime is 663717554660261. The reversal of 663717554660247 is 742066455717366.

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

It is a cyclic number.

It is not a de Polignac number, because 663717554660247 - 2¹⁰ = 663717554659223 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (663717554660047) 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, 110619592443372 + ... + 110619592443377.

It is an arithmetic number, because the mean of its divisors is an integer number (221239184886750).

Almost surely, 2^{663717554660247} is an apocalyptic number.

663717554660247 is a deficient number, since it is larger than the sum of its proper divisors (221239184886753).

663717554660247 is a wasteful number, since it uses less digits than its factorization.

663717554660247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 221239184886752.

The product of its (nonzero) digits is 1066867200, while the sum is 69.

The spelling of 663717554660247 in words is "six hundred sixty-three trillion, seven hundred seventeen billion, five hundred fifty-four million, six hundred sixty thousand, two hundred forty-seven".