118665892721 has 2 divisors, whose sum is σ = 118665892722. Its totient is φ = 118665892720.

The previous prime is 118665892673. The next prime is 118665892753. The reversal of 118665892721 is 127298566811.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 111799284496 + 6866608225 = 334364^2 + 82865^2 .

It is a cyclic number.

It is not a de Polignac number, because 118665892721 - 2¹⁴ = 118665876337 is a prime.

It is not a weakly prime, because it can be changed into another prime (118665892621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 59332946360 + 59332946361.

It is an arithmetic number, because the mean of its divisors is an integer number (59332946361).

Almost surely, 2^118665892721 is an apocalyptic number.

It is an amenable number.

118665892721 is a deficient number, since it is larger than the sum of its proper divisors (1).

118665892721 is an equidigital number, since it uses as much as digits as its factorization.

118665892721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2903040, while the sum is 56.

The spelling of 118665892721 in words is "one hundred eighteen billion, six hundred sixty-five million, eight hundred ninety-two thousand, seven hundred twenty-one".