118235081621681 has 4 divisors (see below), whose sum is σ = 118238856840000. Its totient is φ = 118231306403364.

The previous prime is 118235081621677. The next prime is 118235081621707. The reversal of 118235081621681 is 186126180532811.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 118235081621681 - 2² = 118235081621677 is a prime.

It is a super-2 number, since 2×118235081621681² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (118235081626681) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1887562181 + ... + 1887624818.

It is an arithmetic number, because the mean of its divisors is an integer number (29559714210000).

Almost surely, 2^{118235081621681} is an apocalyptic number.

It is an amenable number.

118235081621681 is a deficient number, since it is larger than the sum of its proper divisors (3775218319).

118235081621681 is an equidigital number, since it uses as much as digits as its factorization.

118235081621681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3775218318.

The product of its (nonzero) digits is 1105920, while the sum is 53.

The spelling of 118235081621681 in words is "one hundred eighteen trillion, two hundred thirty-five billion, eighty-one million, six hundred twenty-one thousand, six hundred eighty-one".