42188475779 has 2 divisors, whose sum is σ = 42188475780. Its totient is φ = 42188475778.

The previous prime is 42188475773. The next prime is 42188475803. The reversal of 42188475779 is 97757488124.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42188475779 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (42188475773) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21094237889 + 21094237890.

It is an arithmetic number, because the mean of its divisors is an integer number (21094237890).

Almost surely, 2^42188475779 is an apocalyptic number.

42188475779 is a deficient number, since it is larger than the sum of its proper divisors (1).

42188475779 is an equidigital number, since it uses as much as digits as its factorization.

42188475779 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 31610880, while the sum is 62.

The spelling of 42188475779 in words is "forty-two billion, one hundred eighty-eight million, four hundred seventy-five thousand, seven hundred seventy-nine".