18981496273 has 2 divisors, whose sum is σ = 18981496274. Its totient is φ = 18981496272.

The previous prime is 18981496231. The next prime is 18981496277. The reversal of 18981496273 is 37269418981.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14455974289 + 4525521984 = 120233^2 + 67272^2 .

It is a cyclic number.

It is not a de Polignac number, because 18981496273 - 2¹³ = 18981488081 is a prime.

It is not a weakly prime, because it can be changed into another prime (18981496277) 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, 9490748136 + 9490748137.

It is an arithmetic number, because the mean of its divisors is an integer number (9490748137).

Almost surely, 2^18981496273 is an apocalyptic number.

It is an amenable number.

18981496273 is a deficient number, since it is larger than the sum of its proper divisors (1).

18981496273 is an equidigital number, since it uses as much as digits as its factorization.

18981496273 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5225472, while the sum is 58.

The spelling of 18981496273 in words is "eighteen billion, nine hundred eighty-one million, four hundred ninety-six thousand, two hundred seventy-three".