18702967649 has 2 divisors, whose sum is σ = 18702967650. Its totient is φ = 18702967648.

The previous prime is 18702967579. The next prime is 18702967721. The reversal of 18702967649 is 94676920781.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17673841249 + 1029126400 = 132943^2 + 32080^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18702967649 is a prime.

It is not a weakly prime, because it can be changed into another prime (18702960649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9351483824 + 9351483825.

It is an arithmetic number, because the mean of its divisors is an integer number (9351483825).

Almost surely, 2^18702967649 is an apocalyptic number.

It is an amenable number.

18702967649 is a deficient number, since it is larger than the sum of its proper divisors (1).

18702967649 is an equidigital number, since it uses as much as digits as its factorization.

18702967649 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9144576, while the sum is 59.

The spelling of 18702967649 in words is "eighteen billion, seven hundred two million, nine hundred sixty-seven thousand, six hundred forty-nine".