42778039939 has 2 divisors, whose sum is σ = 42778039940. Its totient is φ = 42778039938.

The previous prime is 42778039873. The next prime is 42778039951. The reversal of 42778039939 is 93993087724.

42778039939 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 42778039939 - 2¹⁷ = 42777908867 is a prime.

It is not a weakly prime, because it can be changed into another prime (42778039439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21389019969 + 21389019970.

It is an arithmetic number, because the mean of its divisors is an integer number (21389019970).

Almost surely, 2^42778039939 is an apocalyptic number.

42778039939 is a deficient number, since it is larger than the sum of its proper divisors (1).

42778039939 is an equidigital number, since it uses as much as digits as its factorization.

42778039939 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20575296, while the sum is 61.

The spelling of 42778039939 in words is "forty-two billion, seven hundred seventy-eight million, thirty-nine thousand, nine hundred thirty-nine".