18384680624881 has 2 divisors, whose sum is σ = 18384680624882. Its totient is φ = 18384680624880.

The previous prime is 18384680624749. The next prime is 18384680624911. The reversal of 18384680624881 is 18842608648381.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16503418753600 + 1881261871281 = 4062440^2 + 1371591^2 .

It is a cyclic number.

It is not a de Polignac number, because 18384680624881 - 2³⁹ = 17834924810993 is a prime.

It is a super-2 number, since 2×18384680624881² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (18384680604881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9192340312440 + 9192340312441.

It is an arithmetic number, because the mean of its divisors is an integer number (9192340312441).

Almost surely, 2^{18384680624881} is an apocalyptic number.

It is an amenable number.

18384680624881 is a deficient number, since it is larger than the sum of its proper divisors (1).

18384680624881 is an equidigital number, since it uses as much as digits as its factorization.

18384680624881 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 113246208, while the sum is 67.

The spelling of 18384680624881 in words is "eighteen trillion, three hundred eighty-four billion, six hundred eighty million, six hundred twenty-four thousand, eight hundred eighty-one".