663886756 has 27 divisors (see below), whose sum is σ = 1259316513. Its totient is φ = 306100080.

The previous prime is 663886753. The next prime is 663886787. The reversal of 663886756 is 657688366.

The square root of 663886756 is 25766.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 98208100 + 565678656 = 9910^2 + 23784^2 .

It is a junction number, because it is equal to n+sod(n) for n = 663886697 and 663886706.

It is not an unprimeable number, because it can be changed into a prime (663886753) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 669421 + ... + 670411.

Almost surely, 2^663886756 is an apocalyptic number.

663886756 is the 25766-th square number.

It is an amenable number.

663886756 is a deficient number, since it is larger than the sum of its proper divisors (595429757).

663886756 is an equidigital number, since it uses as much as digits as its factorization.

663886756 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2012 (or 1006 counting only the distinct ones).

The product of its digits is 8709120, while the sum is 55.

The cubic root of 663886756 is about 872.3645352532.

The spelling of 663886756 in words is "six hundred sixty-three million, eight hundred eighty-six thousand, seven hundred fifty-six".