18902222355681 has 12 divisors (see below), whose sum is σ = 31203668650752. Its totient is φ = 10801269917496.

The previous prime is 18902222355671. The next prime is 18902222355683. The reversal of 18902222355681 is 18655322220981.

18902222355681 is a `hidden beast` number, since 1 + 8 + 9 + 0 + 2 + 2 + 2 + 2 + 3 + 556 + 81 = 666.

It is not a de Polignac number, because 18902222355681 - 2¹¹ = 18902222353633 is a prime.

It is a super-2 number, since 2×18902222355681² (a number of 27 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (54) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (18902222355683) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 150017637681 + ... + 150017637806.

It is an arithmetic number, because the mean of its divisors is an integer number (2600305720896).

Almost surely, 2^{18902222355681} is an apocalyptic number.

It is an amenable number.

18902222355681 is a deficient number, since it is larger than the sum of its proper divisors (12301446295071).

18902222355681 is a wasteful number, since it uses less digits than its factorization.

18902222355681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 300035275500 (or 300035275497 counting only the distinct ones).

The product of its (nonzero) digits is 4147200, while the sum is 54.

The spelling of 18902222355681 in words is "eighteen trillion, nine hundred two billion, two hundred twenty-two million, three hundred fifty-five thousand, six hundred eighty-one".