663955679649 has 12 divisors (see below), whose sum is σ = 934319905296. Its totient is φ = 419340428568.

The previous prime is 663955679593. The next prime is 663955679689. The reversal of 663955679649 is 946976559366.

It is not a de Polignac number, because 663955679649 - 2¹⁹ = 663955155361 is a prime.

It is not an unprimeable number, because it can be changed into a prime (663955679689) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 306534319 + ... + 306536484.

It is an arithmetic number, because the mean of its divisors is an integer number (77859992108).

Almost surely, 2^663955679649 is an apocalyptic number.

It is an amenable number.

663955679649 is a deficient number, since it is larger than the sum of its proper divisors (270364225647).

663955679649 is a wasteful number, since it uses less digits than its factorization.

663955679649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 613070844 (or 613070825 counting only the distinct ones).

The product of its digits is 1984046400, while the sum is 75.

The spelling of 663955679649 in words is "six hundred sixty-three billion, nine hundred fifty-five million, six hundred seventy-nine thousand, six hundred forty-nine".