8660636667649 has 2 divisors, whose sum is σ = 8660636667650. Its totient is φ = 8660636667648.

The previous prime is 8660636667607. The next prime is 8660636667667. The reversal of 8660636667649 is 9467666360668.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4964015192049 + 3696621475600 = 2228007^2 + 1922660^2 .

It is a cyclic number.

It is not a de Polignac number, because 8660636667649 - 2¹⁷ = 8660636536577 is a prime.

It is not a weakly prime, because it can be changed into another prime (8660636667679) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4330318333824 + 4330318333825.

It is an arithmetic number, because the mean of its divisors is an integer number (4330318333825).

Almost surely, 2^{8660636667649} is an apocalyptic number.

It is an amenable number.

8660636667649 is a deficient number, since it is larger than the sum of its proper divisors (1).

8660636667649 is an equidigital number, since it uses as much as digits as its factorization.

8660636667649 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1693052928, while the sum is 73.

The spelling of 8660636667649 in words is "eight trillion, six hundred sixty billion, six hundred thirty-six million, six hundred sixty-seven thousand, six hundred forty-nine".