118216308877 has 4 divisors (see below), whose sum is σ = 118217173500. Its totient is φ = 118215444256.

The previous prime is 118216308853. The next prime is 118216308893. The reversal of 118216308877 is 778803612811.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 778803612811 = 7 ⋅111257658973.

It can be written as a sum of positive squares in 2 ways, for example, as 73530999556 + 44685309321 = 271166^2 + 211389^2 .

It is a cyclic number.

It is not a de Polignac number, because 118216308877 - 2¹⁵ = 118216276109 is a prime.

It is a super-2 number, since 2×118216308877² (a number of 23 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 (118216308377) 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, 176938 + ... + 517435.

It is an arithmetic number, because the mean of its divisors is an integer number (29554293375).

Almost surely, 2^118216308877 is an apocalyptic number.

It is an amenable number.

118216308877 is a deficient number, since it is larger than the sum of its proper divisors (864623).

118216308877 is an equidigital number, since it uses as much as digits as its factorization.

118216308877 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 864622.

The product of its (nonzero) digits is 903168, while the sum is 52.

The spelling of 118216308877 in words is "one hundred eighteen billion, two hundred sixteen million, three hundred eight thousand, eight hundred seventy-seven".