63636681 has 16 divisors (see below), whose sum is σ = 90397440. Its totient is φ = 39704400.

The previous prime is 63636679. The next prime is 63636697. The reversal of 63636681 is 18663636.

It is not a de Polignac number, because 63636681 - 2¹ = 63636679 is a prime.

It is a super-2 number, since 2×63636681² = 8099254337391522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (63636611) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1995 + ... + 11456.

It is an arithmetic number, because the mean of its divisors is an integer number (5649840).

Almost surely, 2^63636681 is an apocalyptic number.

It is an amenable number.

63636681 is a deficient number, since it is larger than the sum of its proper divisors (26760759).

63636681 is a wasteful number, since it uses less digits than its factorization.

63636681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13556.

The product of its digits is 93312, while the sum is 39.

The square root of 63636681 is about 7977.2602439685. The cubic root of 63636681 is about 399.2416485831.

The spelling of 63636681 in words is "sixty-three million, six hundred thirty-six thousand, six hundred eighty-one".