378785495861 has 2 divisors, whose sum is σ = 378785495862. Its totient is φ = 378785495860.

The previous prime is 378785495849. The next prime is 378785495899. The reversal of 378785495861 is 168594587873.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 358591380625 + 20194115236 = 598825^2 + 142106^2 .

It is an emirp because it is prime and its reverse (168594587873) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-378785495861 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (378785495831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 189392747930 + 189392747931.

It is an arithmetic number, because the mean of its divisors is an integer number (189392747931).

Almost surely, 2^378785495861 is an apocalyptic number.

It is an amenable number.

378785495861 is a deficient number, since it is larger than the sum of its proper divisors (1).

378785495861 is an equidigital number, since it uses as much as digits as its factorization.

378785495861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 406425600, while the sum is 71.

The spelling of 378785495861 in words is "three hundred seventy-eight billion, seven hundred eighty-five million, four hundred ninety-five thousand, eight hundred sixty-one".