18354071254681 has 2 divisors, whose sum is σ = 18354071254682. Its totient is φ = 18354071254680.

The previous prime is 18354071254661. The next prime is 18354071254721. The reversal of 18354071254681 is 18645217045381.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13951980505225 + 4402090749456 = 3735235^2 + 2098116^2 .

It is an emirp because it is prime and its reverse (18645217045381) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18354071254681 - 2³⁵ = 18319711516313 is a prime.

It is a super-2 number, since 2×18354071254681² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (18354071254601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9177035627340 + 9177035627341.

It is an arithmetic number, because the mean of its divisors is an integer number (9177035627341).

Almost surely, 2^{18354071254681} is an apocalyptic number.

It is an amenable number.

18354071254681 is a deficient number, since it is larger than the sum of its proper divisors (1).

18354071254681 is an equidigital number, since it uses as much as digits as its factorization.

18354071254681 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6451200, while the sum is 55.

The spelling of 18354071254681 in words is "eighteen trillion, three hundred fifty-four billion, seventy-one million, two hundred fifty-four thousand, six hundred eighty-one".