61118719979 has 2 divisors, whose sum is σ = 61118719980. Its totient is φ = 61118719978.

The previous prime is 61118719939. The next prime is 61118720017. The reversal of 61118719979 is 97991781116.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61118719979 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (61118719939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30559359989 + 30559359990.

It is an arithmetic number, because the mean of its divisors is an integer number (30559359990).

Almost surely, 2^61118719979 is an apocalyptic number.

61118719979 is a deficient number, since it is larger than the sum of its proper divisors (1).

61118719979 is an equidigital number, since it uses as much as digits as its factorization.

61118719979 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1714608, while the sum is 59.

The spelling of 61118719979 in words is "sixty-one billion, one hundred eighteen million, seven hundred nineteen thousand, nine hundred seventy-nine".