18268264661 has 2 divisors, whose sum is σ = 18268264662. Its totient is φ = 18268264660.

The previous prime is 18268264657. The next prime is 18268264687. The reversal of 18268264661 is 16646286281.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10002000100 + 8266264561 = 100010^2 + 90919^2 .

It is a cyclic number.

It is not a de Polignac number, because 18268264661 - 2² = 18268264657 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18268264631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9134132330 + 9134132331.

It is an arithmetic number, because the mean of its divisors is an integer number (9134132331).

Almost surely, 2^18268264661 is an apocalyptic number.

It is an amenable number.

18268264661 is a deficient number, since it is larger than the sum of its proper divisors (1).

18268264661 is an equidigital number, since it uses as much as digits as its factorization.

18268264661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1327104, while the sum is 50.

The spelling of 18268264661 in words is "eighteen billion, two hundred sixty-eight million, two hundred sixty-four thousand, six hundred sixty-one".