18366612461 has 2 divisors, whose sum is σ = 18366612462. Its totient is φ = 18366612460.

The previous prime is 18366612443. The next prime is 18366612497. The reversal of 18366612461 is 16421666381.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11328409225 + 7038203236 = 106435^2 + 83894^2 .

It is an emirp because it is prime and its reverse (16421666381) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18366612461 - 2¹⁰ = 18366611437 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18366612401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9183306230 + 9183306231.

It is an arithmetic number, because the mean of its divisors is an integer number (9183306231).

Almost surely, 2^18366612461 is an apocalyptic number.

It is an amenable number.

18366612461 is a deficient number, since it is larger than the sum of its proper divisors (1).

18366612461 is an equidigital number, since it uses as much as digits as its factorization.

18366612461 is an evil number, because the sum of its binary digits is even.

The product of its digits is 248832, while the sum is 44.

The spelling of 18366612461 in words is "eighteen billion, three hundred sixty-six million, six hundred twelve thousand, four hundred sixty-one".