8636351681 has 2 divisors, whose sum is σ = 8636351682. Its totient is φ = 8636351680.

The previous prime is 8636351629. The next prime is 8636351687. The reversal of 8636351681 is 1861536368.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7066924225 + 1569427456 = 84065^2 + 39616^2 .

It is a cyclic number.

It is not a de Polignac number, because 8636351681 - 2²⁶ = 8569242817 is a prime.

It is a super-2 number, since 2×8636351681² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (8636351687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4318175840 + 4318175841.

It is an arithmetic number, because the mean of its divisors is an integer number (4318175841).

Almost surely, 2^8636351681 is an apocalyptic number.

It is an amenable number.

8636351681 is a deficient number, since it is larger than the sum of its proper divisors (1).

8636351681 is an equidigital number, since it uses as much as digits as its factorization.

8636351681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 622080, while the sum is 47.

The square root of 8636351681 is about 92931.9734052818. The cubic root of 8636351681 is about 2051.6822741586.

The spelling of 8636351681 in words is "eight billion, six hundred thirty-six million, three hundred fifty-one thousand, six hundred eighty-one".