18677270981 has 2 divisors, whose sum is σ = 18677270982. Its totient is φ = 18677270980.

The previous prime is 18677270947. The next prime is 18677270999. The reversal of 18677270981 is 18907277681.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15342785956 + 3334485025 = 123866^2 + 57745^2 .

It is a cyclic number.

It is not a de Polignac number, because 18677270981 - 2²⁶ = 18610162117 is a prime.

It is a super-2 number, since 2×18677270981² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18677270081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9338635490 + 9338635491.

It is an arithmetic number, because the mean of its divisors is an integer number (9338635491).

Almost surely, 2^18677270981 is an apocalyptic number.

It is an amenable number.

18677270981 is a deficient number, since it is larger than the sum of its proper divisors (1).

18677270981 is an equidigital number, since it uses as much as digits as its factorization.

18677270981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2370816, while the sum is 56.

The spelling of 18677270981 in words is "eighteen billion, six hundred seventy-seven million, two hundred seventy thousand, nine hundred eighty-one".