118421718991 has 2 divisors, whose sum is σ = 118421718992. Its totient is φ = 118421718990.

The previous prime is 118421718941. The next prime is 118421719049. The reversal of 118421718991 is 199817124811.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 118421718991 - 2¹¹ = 118421716943 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (118421718941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 59210859495 + 59210859496.

It is an arithmetic number, because the mean of its divisors is an integer number (59210859496).

Almost surely, 2^118421718991 is an apocalyptic number.

118421718991 is a deficient number, since it is larger than the sum of its proper divisors (1).

118421718991 is an equidigital number, since it uses as much as digits as its factorization.

118421718991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 290304, while the sum is 52.

The spelling of 118421718991 in words is "one hundred eighteen billion, four hundred twenty-one million, seven hundred eighteen thousand, nine hundred ninety-one".