18906913064693 has 2 divisors, whose sum is σ = 18906913064694. Its totient is φ = 18906913064692.

The previous prime is 18906913064657. The next prime is 18906913064713. The reversal of 18906913064693 is 39646031960981.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9830871118084 + 9076041946609 = 3135422^2 + 3012647^2 .

It is a cyclic number.

It is not a de Polignac number, because 18906913064693 - 2⁶ = 18906913064629 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18906913064623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9453456532346 + 9453456532347.

It is an arithmetic number, because the mean of its divisors is an integer number (9453456532347).

Almost surely, 2^{18906913064693} is an apocalyptic number.

It is an amenable number.

18906913064693 is a deficient number, since it is larger than the sum of its proper divisors (1).

18906913064693 is an equidigital number, since it uses as much as digits as its factorization.

18906913064693 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 45349632, while the sum is 65.

The spelling of 18906913064693 in words is "eighteen trillion, nine hundred six billion, nine hundred thirteen million, sixty-four thousand, six hundred ninety-three".