118418645581 has 2 divisors, whose sum is σ = 118418645582. Its totient is φ = 118418645580.

The previous prime is 118418645561. The next prime is 118418645593. The reversal of 118418645581 is 185546814811.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 88173957481 + 30244688100 = 296941^2 + 173910^2 .

It is a cyclic number.

It is not a de Polignac number, because 118418645581 - 2¹⁷ = 118418514509 is a prime.

It is a super-2 number, since 2×118418645581² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (118418645561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 59209322790 + 59209322791.

It is an arithmetic number, because the mean of its divisors is an integer number (59209322791).

Almost surely, 2^118418645581 is an apocalyptic number.

It is an amenable number.

118418645581 is a deficient number, since it is larger than the sum of its proper divisors (1).

118418645581 is an equidigital number, since it uses as much as digits as its factorization.

118418645581 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1228800, while the sum is 52.

The spelling of 118418645581 in words is "one hundred eighteen billion, four hundred eighteen million, six hundred forty-five thousand, five hundred eighty-one".