18774486380681 has 2 divisors, whose sum is σ = 18774486380682. Its totient is φ = 18774486380680.

The previous prime is 18774486380659. The next prime is 18774486380723. The reversal of 18774486380681 is 18608368447781.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9483572770681 + 9290913610000 = 3079541^2 + 3048100^2 .

It is a cyclic number.

It is not a de Polignac number, because 18774486380681 - 2⁴² = 14376439869577 is a prime.

It is a super-2 number, since 2×18774486380681² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (18774486380981) 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, 9387243190340 + 9387243190341.

It is an arithmetic number, because the mean of its divisors is an integer number (9387243190341).

Almost surely, 2^{18774486380681} is an apocalyptic number.

It is an amenable number.

18774486380681 is a deficient number, since it is larger than the sum of its proper divisors (1).

18774486380681 is an equidigital number, since it uses as much as digits as its factorization.

18774486380681 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 346816512, while the sum is 71.

The spelling of 18774486380681 in words is "eighteen trillion, seven hundred seventy-four billion, four hundred eighty-six million, three hundred eighty thousand, six hundred eighty-one".