663655616615513 has 4 divisors (see below), whose sum is σ = 663656104149888. Its totient is φ = 663655129081140.

The previous prime is 663655616615507. The next prime is 663655616615527. The reversal of 663655616615513 is 315516616556366.

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 663655616615513 - 2¹⁰ = 663655616614489 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 663655616615513.

It is not an unprimeable number, because it can be changed into a prime (663655616615813) 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, 241719581 + ... + 244449722.

It is an arithmetic number, because the mean of its divisors is an integer number (165914026037472).

Almost surely, 2^{663655616615513} is an apocalyptic number.

It is an amenable number.

663655616615513 is a deficient number, since it is larger than the sum of its proper divisors (487534375).

663655616615513 is a wasteful number, since it uses less digits than its factorization.

663655616615513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 487534374.

The product of its digits is 262440000, while the sum is 65.

The spelling of 663655616615513 in words is "six hundred sixty-three trillion, six hundred fifty-five billion, six hundred sixteen million, six hundred fifteen thousand, five hundred thirteen".