63618881 has 2 divisors, whose sum is σ = 63618882. Its totient is φ = 63618880.

The previous prime is 63618857. The next prime is 63618889. The reversal of 63618881 is 18881636.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 51480625 + 12138256 = 7175^2 + 3484^2 .

It is a cyclic number.

It is not a de Polignac number, because 63618881 - 2²² = 59424577 is a prime.

It is a super-2 number, since 2×63618881² = 8094724039384322, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (63618889) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31809440 + 31809441.

It is an arithmetic number, because the mean of its divisors is an integer number (31809441).

Almost surely, 2^63618881 is an apocalyptic number.

It is an amenable number.

63618881 is a deficient number, since it is larger than the sum of its proper divisors (1).

63618881 is an equidigital number, since it uses as much as digits as its factorization.

63618881 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 55296, while the sum is 41.

The square root of 63618881 is about 7976.1444946791. The cubic root of 63618881 is about 399.2044207666.

The spelling of 63618881 in words is "sixty-three million, six hundred eighteen thousand, eight hundred eighty-one".