663976809031 has 4 divisors (see below), whose sum is σ = 681922128232. Its totient is φ = 646031489832.

The previous prime is 663976809019. The next prime is 663976809037. The reversal of 663976809031 is 130908679366.

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

It is not a de Polignac number, because 663976809031 - 2⁹ = 663976808519 is a prime.

It is a super-2 number, since 2×663976809031² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (663976809037) 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, 8972659545 + ... + 8972659618.

It is an arithmetic number, because the mean of its divisors is an integer number (170480532058).

Almost surely, 2^663976809031 is an apocalyptic number.

663976809031 is a deficient number, since it is larger than the sum of its proper divisors (17945319201).

663976809031 is a wasteful number, since it uses less digits than its factorization.

663976809031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17945319200.

The product of its (nonzero) digits is 8817984, while the sum is 58.

The spelling of 663976809031 in words is "six hundred sixty-three billion, nine hundred seventy-six million, eight hundred nine thousand, thirty-one".