63656803809 has 27 divisors (see below), whose sum is σ = 94542575673. Its totient is φ = 41272733952.

The previous prime is 63656803801. The next prime is 63656803813. The reversal of 63656803809 is 90830865636.

The square root of 63656803809 is 252303.

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

It can be written as a sum of positive squares in 4 ways, for example, as 39264611409 + 24392192400 = 198153^2 + 156180^2 .

It is not a de Polignac number, because 63656803809 - 2³ = 63656803801 is a prime.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (63656803801) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 28004497 + ... + 28006769.

Almost surely, 2^63656803809 is an apocalyptic number.

63656803809 is the 252303-rd square number.

63656803809 is the 126152-nd centered octagonal number.

It is an amenable number.

63656803809 is a deficient number, since it is larger than the sum of its proper divisors (30885771864).

63656803809 is an frugal number, since it uses more digits than its factorization.

63656803809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4626 (or 2313 counting only the distinct ones).

The product of its (nonzero) digits is 5598720, while the sum is 54.

The spelling of 63656803809 in words is "sixty-three billion, six hundred fifty-six million, eight hundred three thousand, eight hundred nine".