663892266681 has 48 divisors (see below), whose sum is σ = 1118703705600. Its totient is φ = 379235304000.

The previous prime is 663892266673. The next prime is 663892266721. The reversal of 663892266681 is 186662298366.

It is not a de Polignac number, because 663892266681 - 2³ = 663892266673 is a prime.

It is a super-2 number, since 2×663892266681² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is not an unprimeable number, because it can be changed into a prime (663892226681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 9228256 + ... + 9299918.

It is an arithmetic number, because the mean of its divisors is an integer number (23306327200).

Almost surely, 2^663892266681 is an apocalyptic number.

It is an amenable number.

663892266681 is a deficient number, since it is larger than the sum of its proper divisors (454811438919).

663892266681 is a wasteful number, since it uses less digits than its factorization.

663892266681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74691 (or 74674 counting only the distinct ones).

The product of its digits is 53747712, while the sum is 63.

The spelling of 663892266681 in words is "six hundred sixty-three billion, eight hundred ninety-two million, two hundred sixty-six thousand, six hundred eighty-one".