663544377 has 24 divisors (see below), whose sum is σ = 973517064. Its totient is φ = 435435264.

The previous prime is 663544373. The next prime is 663544379. The reversal of 663544377 is 773445366.

663544377 is a `hidden beast` number, since 6 + 635 + 4 + 4 + 3 + 7 + 7 = 666.

663544377 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 43086096 + 620458281 = 6564^2 + 24909^2 .

It is not a de Polignac number, because 663544377 - 2² = 663544373 is a prime.

It is a super-2 number, since 2×663544377² = 880582280496636258, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (663544373) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 654523 + ... + 655535.

It is an arithmetic number, because the mean of its divisors is an integer number (40563211).

Almost surely, 2^663544377 is an apocalyptic number.

It is an amenable number.

663544377 is a deficient number, since it is larger than the sum of its proper divisors (309972687).

663544377 is a wasteful number, since it uses less digits than its factorization.

663544377 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2089 (or 2086 counting only the distinct ones).

The product of its digits is 1270080, while the sum is 45.

The square root of 663544377 is about 25759.3551355619. The cubic root of 663544377 is about 872.2145444834.

The spelling of 663544377 in words is "six hundred sixty-three million, five hundred forty-four thousand, three hundred seventy-seven".