8377393861 has 2 divisors, whose sum is σ = 8377393862. Its totient is φ = 8377393860.

The previous prime is 8377393847. The next prime is 8377393867. The reversal of 8377393861 is 1683937738.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5269888836 + 3107505025 = 72594^2 + 55745^2 .

It is a cyclic number.

It is not a de Polignac number, because 8377393861 - 2³¹ = 6229910213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8377393867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4188696930 + 4188696931.

It is an arithmetic number, because the mean of its divisors is an integer number (4188696931).

Almost surely, 2^8377393861 is an apocalyptic number.

It is an amenable number.

8377393861 is a deficient number, since it is larger than the sum of its proper divisors (1).

8377393861 is an equidigital number, since it uses as much as digits as its factorization.

8377393861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4572288, while the sum is 55.

The square root of 8377393861 is about 91528.1042139517. The cubic root of 8377393861 is about 2030.9675199816.

The spelling of 8377393861 in words is "eight billion, three hundred seventy-seven million, three hundred ninety-three thousand, eight hundred sixty-one".