18891974800367 has 2 divisors, whose sum is σ = 18891974800368. Its totient is φ = 18891974800366.

The previous prime is 18891974800297. The next prime is 18891974800397. The reversal of 18891974800367 is 76300847919881.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18891974800367 - 2¹⁰ = 18891974799343 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18891974800367.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18891974800397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9445987400183 + 9445987400184.

It is an arithmetic number, because the mean of its divisors is an integer number (9445987400184).

Almost surely, 2^{18891974800367} is an apocalyptic number.

18891974800367 is a deficient number, since it is larger than the sum of its proper divisors (1).

18891974800367 is an equidigital number, since it uses as much as digits as its factorization.

18891974800367 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 146313216, while the sum is 71.

The spelling of 18891974800367 in words is "eighteen trillion, eight hundred ninety-one billion, nine hundred seventy-four million, eight hundred thousand, three hundred sixty-seven".