18614795981 has 2 divisors, whose sum is σ = 18614795982. Its totient is φ = 18614795980.

The previous prime is 18614795971. The next prime is 18614796001. The reversal of 18614795981 is 18959741681.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13393432900 + 5221363081 = 115730^2 + 72259^2 .

It is a cyclic number.

It is not a de Polignac number, because 18614795981 - 2⁶ = 18614795917 is a prime.

It is a super-2 number, since 2×18614795981² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 18614795981.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18614795911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9307397990 + 9307397991.

It is an arithmetic number, because the mean of its divisors is an integer number (9307397991).

Almost surely, 2^18614795981 is an apocalyptic number.

It is an amenable number.

18614795981 is a deficient number, since it is larger than the sum of its proper divisors (1).

18614795981 is an equidigital number, since it uses as much as digits as its factorization.

18614795981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4354560, while the sum is 59.

The spelling of 18614795981 in words is "eighteen billion, six hundred fourteen million, seven hundred ninety-five thousand, nine hundred eighty-one".