18154768613 has 2 divisors, whose sum is σ = 18154768614. Its totient is φ = 18154768612.

The previous prime is 18154768591. The next prime is 18154768649. The reversal of 18154768613 is 31686745181.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17999442244 + 155326369 = 134162^2 + 12463^2 .

It is a cyclic number.

It is not a de Polignac number, because 18154768613 - 2¹² = 18154764517 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18154768663) 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, 9077384306 + 9077384307.

It is an arithmetic number, because the mean of its divisors is an integer number (9077384307).

Almost surely, 2^18154768613 is an apocalyptic number.

It is an amenable number.

18154768613 is a deficient number, since it is larger than the sum of its proper divisors (1).

18154768613 is an equidigital number, since it uses as much as digits as its factorization.

18154768613 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 967680, while the sum is 50.

The spelling of 18154768613 in words is "eighteen billion, one hundred fifty-four million, seven hundred sixty-eight thousand, six hundred thirteen".