7878385901 has 2 divisors, whose sum is σ = 7878385902. Its totient is φ = 7878385900.

The previous prime is 7878385843. The next prime is 7878385961. The reversal of 7878385901 is 1095838787.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7812792100 + 65593801 = 88390^2 + 8099^2 .

It is an emirp because it is prime and its reverse (1095838787) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7878385901 - 2²⁶ = 7811277037 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7878385961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3939192950 + 3939192951.

It is an arithmetic number, because the mean of its divisors is an integer number (3939192951).

Almost surely, 2^7878385901 is an apocalyptic number.

It is an amenable number.

7878385901 is a deficient number, since it is larger than the sum of its proper divisors (1).

7878385901 is an equidigital number, since it uses as much as digits as its factorization.

7878385901 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3386880, while the sum is 56.

The square root of 7878385901 is about 88760.2720872351. The cubic root of 7878385901 is about 1989.8136994689.

The spelling of 7878385901 in words is "seven billion, eight hundred seventy-eight million, three hundred eighty-five thousand, nine hundred one".