8767557661 has 2 divisors, whose sum is σ = 8767557662. Its totient is φ = 8767557660.

The previous prime is 8767557653. The next prime is 8767557683. The reversal of 8767557661 is 1667557678.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4421452036 + 4346105625 = 66494^2 + 65925^2 .

It is a cyclic number.

It is not a de Polignac number, because 8767557661 - 2³ = 8767557653 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 8767557596 and 8767557605.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8767057661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4383778830 + 4383778831.

It is an arithmetic number, because the mean of its divisors is an integer number (4383778831).

Almost surely, 2^8767557661 is an apocalyptic number.

It is an amenable number.

8767557661 is a deficient number, since it is larger than the sum of its proper divisors (1).

8767557661 is an equidigital number, since it uses as much as digits as its factorization.

8767557661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 14817600, while the sum is 58.

The square root of 8767557661 is about 93635.2372827666. The cubic root of 8767557661 is about 2062.0200172381.

The spelling of 8767557661 in words is "eight billion, seven hundred sixty-seven million, five hundred fifty-seven thousand, six hundred sixty-one".