118121617374781 has 4 divisors (see below), whose sum is σ = 118150790413500. Its totient is φ = 118092444336064.

The previous prime is 118121617374773. The next prime is 118121617374793. The reversal of 118121617374781 is 187473716121811.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8408457270756 + 109713160104025 = 2899734^2 + 10474405^2 .

It is a cyclic number.

It is not a de Polignac number, because 118121617374781 - 2³ = 118121617374773 is a prime.

It is a super-2 number, since 2×118121617374781² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (118121617374701) 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, 14586513286 + ... + 14586521383.

It is an arithmetic number, because the mean of its divisors is an integer number (29537697603375).

Almost surely, 2^{118121617374781} is an apocalyptic number.

It is an amenable number.

118121617374781 is a deficient number, since it is larger than the sum of its proper divisors (29173038719).

118121617374781 is an equidigital number, since it uses as much as digits as its factorization.

118121617374781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29173038718.

The product of its digits is 3161088, while the sum is 58.

The spelling of 118121617374781 in words is "one hundred eighteen trillion, one hundred twenty-one billion, six hundred seventeen million, three hundred seventy-four thousand, seven hundred eighty-one".