118515181493 has 2 divisors, whose sum is σ = 118515181494. Its totient is φ = 118515181492.

The previous prime is 118515181453. The next prime is 118515181507. The reversal of 118515181493 is 394181515811.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 117718982404 + 796199089 = 343102^2 + 28217^2 .

It is a cyclic number.

It is not a de Polignac number, because 118515181493 - 2¹² = 118515177397 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (118515181423) 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, 59257590746 + 59257590747.

It is an arithmetic number, because the mean of its divisors is an integer number (59257590747).

Almost surely, 2^118515181493 is an apocalyptic number.

It is an amenable number.

118515181493 is a deficient number, since it is larger than the sum of its proper divisors (1).

118515181493 is an equidigital number, since it uses as much as digits as its factorization.

118515181493 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 172800, while the sum is 47.

The spelling of 118515181493 in words is "one hundred eighteen billion, five hundred fifteen million, one hundred eighty-one thousand, four hundred ninety-three".