663851087279 has 4 divisors (see below), whose sum is σ = 669725875776. Its totient is φ = 657976298784.

The previous prime is 663851087257. The next prime is 663851087281. The reversal of 663851087279 is 972780158366.

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 663851087279 - 2⁸ = 663851087023 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (663851087239) 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, 2937394079 + ... + 2937394304.

It is an arithmetic number, because the mean of its divisors is an integer number (167431468944).

Almost surely, 2^663851087279 is an apocalyptic number.

663851087279 is a deficient number, since it is larger than the sum of its proper divisors (5874788497).

663851087279 is a wasteful number, since it uses less digits than its factorization.

663851087279 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5874788496.

The product of its (nonzero) digits is 30481920, while the sum is 62.

The spelling of 663851087279 in words is "six hundred sixty-three billion, eight hundred fifty-one million, eighty-seven thousand, two hundred seventy-nine".