63818100081 has 12 divisors (see below), whose sum is σ = 92514489652. Its totient is φ = 42391804896.

The previous prime is 63818099999. The next prime is 63818100131. The reversal of 63818100081 is 18000181836.

63818100081 is a `hidden beast` number, since 638 + 1 + 8 + 10 + 0 + 0 + 8 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 19541523681 + 44276576400 = 139791^2 + 210420^2 .

It is not a de Polignac number, because 63818100081 - 2¹³ = 63818091889 is a prime.

It is a super-2 number, since 2×63818100081² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (63818100781) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12796966 + ... + 12801951.

Almost surely, 2^63818100081 is an apocalyptic number.

It is an amenable number.

63818100081 is a deficient number, since it is larger than the sum of its proper divisors (28696389571).

63818100081 is a wasteful number, since it uses less digits than its factorization.

63818100081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25599200 (or 25599197 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 36.

The spelling of 63818100081 in words is "sixty-three billion, eight hundred eighteen million, one hundred thousand, eighty-one".