8686635493 has 2 divisors, whose sum is σ = 8686635494. Its totient is φ = 8686635492.

The previous prime is 8686635449. The next prime is 8686635539. The reversal of 8686635493 is 3945366868.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8534433924 + 152201569 = 92382^2 + 12337^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8686635493 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8686635443) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4343317746 + 4343317747.

It is an arithmetic number, because the mean of its divisors is an integer number (4343317747).

Almost surely, 2^8686635493 is an apocalyptic number.

It is an amenable number.

8686635493 is a deficient number, since it is larger than the sum of its proper divisors (1).

8686635493 is an equidigital number, since it uses as much as digits as its factorization.

8686635493 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 22394880, while the sum is 58.

The square root of 8686635493 is about 93202.1217194115. The cubic root of 8686635493 is about 2055.6564379130.

The spelling of 8686635493 in words is "eight billion, six hundred eighty-six million, six hundred thirty-five thousand, four hundred ninety-three".