18351666653 has 2 divisors, whose sum is σ = 18351666654. Its totient is φ = 18351666652.

The previous prime is 18351666637. The next prime is 18351666661. The reversal of 18351666653 is 35666615381.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12645677209 + 5705989444 = 112453^2 + 75538^2 .

It is a cyclic number.

It is not a de Polignac number, because 18351666653 - 2⁴ = 18351666637 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18351660653) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9175833326 + 9175833327.

It is an arithmetic number, because the mean of its divisors is an integer number (9175833327).

Almost surely, 2^18351666653 is an apocalyptic number.

It is an amenable number.

18351666653 is a deficient number, since it is larger than the sum of its proper divisors (1).

18351666653 is an equidigital number, since it uses as much as digits as its factorization.

18351666653 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2332800, while the sum is 50.

The spelling of 18351666653 in words is "eighteen billion, three hundred fifty-one million, six hundred sixty-six thousand, six hundred fifty-three".