42646780139 has 2 divisors, whose sum is σ = 42646780140. Its totient is φ = 42646780138.

The previous prime is 42646780081. The next prime is 42646780151. The reversal of 42646780139 is 93108764624.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42646780139 is a prime.

It is not a weakly prime, because it can be changed into another prime (42646780039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21323390069 + 21323390070.

It is an arithmetic number, because the mean of its divisors is an integer number (21323390070).

Almost surely, 2^42646780139 is an apocalyptic number.

42646780139 is a deficient number, since it is larger than the sum of its proper divisors (1).

42646780139 is an equidigital number, since it uses as much as digits as its factorization.

42646780139 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1741824, while the sum is 50.

The spelling of 42646780139 in words is "forty-two billion, six hundred forty-six million, seven hundred eighty thousand, one hundred thirty-nine".