118279581961 has 2 divisors, whose sum is σ = 118279581962. Its totient is φ = 118279581960.

The previous prime is 118279581949. The next prime is 118279581971. The reversal of 118279581961 is 169185972811.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 60506652361 + 57772929600 = 245981^2 + 240360^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-118279581961 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 118279581896 and 118279581905.

It is not a weakly prime, because it can be changed into another prime (118279581971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 59139790980 + 59139790981.

It is an arithmetic number, because the mean of its divisors is an integer number (59139790981).

Almost surely, 2^118279581961 is an apocalyptic number.

It is an amenable number.

118279581961 is a deficient number, since it is larger than the sum of its proper divisors (1).

118279581961 is an equidigital number, since it uses as much as digits as its factorization.

118279581961 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2177280, while the sum is 58.

The spelling of 118279581961 in words is "one hundred eighteen billion, two hundred seventy-nine million, five hundred eighty-one thousand, nine hundred sixty-one".