61840112779 has 2 divisors, whose sum is σ = 61840112780. Its totient is φ = 61840112778.

The previous prime is 61840112773. The next prime is 61840112783. The reversal of 61840112779 is 97721104816.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 61840112779 - 2³ = 61840112771 is a prime.

It is not a weakly prime, because it can be changed into another prime (61840112771) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30920056389 + 30920056390.

It is an arithmetic number, because the mean of its divisors is an integer number (30920056390).

Almost surely, 2^61840112779 is an apocalyptic number.

61840112779 is a deficient number, since it is larger than the sum of its proper divisors (1).

61840112779 is an equidigital number, since it uses as much as digits as its factorization.

61840112779 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 169344, while the sum is 46.

The spelling of 61840112779 in words is "sixty-one billion, eight hundred forty million, one hundred twelve thousand, seven hundred seventy-nine".