663976401 has 32 divisors (see below), whose sum is σ = 981020160. Its totient is φ = 396105600.

The previous prime is 663976381. The next prime is 663976441. The reversal of 663976401 is 104679366.

It is not a de Polignac number, because 663976401 - 2¹⁵ = 663943633 is a prime.

It is a super-2 number, since 2×663976401² = 881729322169825602, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (663976441) 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 31 ways as a sum of consecutive naturals, for example, 971806 + ... + 972488.

It is an arithmetic number, because the mean of its divisors is an integer number (30656880).

Almost surely, 2^663976401 is an apocalyptic number.

It is an amenable number.

663976401 is a deficient number, since it is larger than the sum of its proper divisors (317043759).

663976401 is a wasteful number, since it uses less digits than its factorization.

663976401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1117.

The product of its (nonzero) digits is 163296, while the sum is 42.

The square root of 663976401 is about 25767.7395399752. The cubic root of 663976401 is about 872.4037987764.

The spelling of 663976401 in words is "six hundred sixty-three million, nine hundred seventy-six thousand, four hundred one".