118164457681 has 2 divisors, whose sum is σ = 118164457682. Its totient is φ = 118164457680.

The previous prime is 118164457679. The next prime is 118164457687. The reversal of 118164457681 is 186754461811.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 105556761025 + 12607696656 = 324895^2 + 112284^2 .

It is a cyclic number.

It is not a de Polignac number, because 118164457681 - 2¹ = 118164457679 is a prime.

It is a super-2 number, since 2×118164457681² (a number of 23 digits) contains 22 as substring.

Together with 118164457679, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (118164457687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 59082228840 + 59082228841.

It is an arithmetic number, because the mean of its divisors is an integer number (59082228841).

Almost surely, 2^118164457681 is an apocalyptic number.

It is an amenable number.

118164457681 is a deficient number, since it is larger than the sum of its proper divisors (1).

118164457681 is an equidigital number, since it uses as much as digits as its factorization.

118164457681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1290240, while the sum is 52.

The spelling of 118164457681 in words is "one hundred eighteen billion, one hundred sixty-four million, four hundred fifty-seven thousand, six hundred eighty-one".