18351662632213 has 2 divisors, whose sum is σ = 18351662632214. Its totient is φ = 18351662632212.

The previous prime is 18351662632159. The next prime is 18351662632241. The reversal of 18351662632213 is 31223626615381.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10285477581604 + 8066185050609 = 3207098^2 + 2840103^2 .

It is a cyclic number.

It is not a de Polignac number, because 18351662632213 - 2¹³ = 18351662624021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18351662639213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9175831316106 + 9175831316107.

It is an arithmetic number, because the mean of its divisors is an integer number (9175831316107).

Almost surely, 2^{18351662632213} is an apocalyptic number.

It is an amenable number.

18351662632213 is a deficient number, since it is larger than the sum of its proper divisors (1).

18351662632213 is an equidigital number, since it uses as much as digits as its factorization.

18351662632213 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1866240, while the sum is 49.

It can be divided in two parts, 18351 and 662632213, that added together give a square (662650564 = 25742²).

The spelling of 18351662632213 in words is "eighteen trillion, three hundred fifty-one billion, six hundred sixty-two million, six hundred thirty-two thousand, two hundred thirteen".