42378010309 has 2 divisors, whose sum is σ = 42378010310. Its totient is φ = 42378010308.

The previous prime is 42378010277. The next prime is 42378010331. The reversal of 42378010309 is 90301087324.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 38581602084 + 3796408225 = 196422^2 + 61615^2 .

It is a cyclic number.

It is not a de Polignac number, because 42378010309 - 2⁵ = 42378010277 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42378010399) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21189005154 + 21189005155.

It is an arithmetic number, because the mean of its divisors is an integer number (21189005155).

Almost surely, 2^42378010309 is an apocalyptic number.

It is an amenable number.

42378010309 is a deficient number, since it is larger than the sum of its proper divisors (1).

42378010309 is an equidigital number, since it uses as much as digits as its factorization.

42378010309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36288, while the sum is 37.

The spelling of 42378010309 in words is "forty-two billion, three hundred seventy-eight million, ten thousand, three hundred nine".