8377943144861 has 2 divisors, whose sum is σ = 8377943144862. Its totient is φ = 8377943144860.

The previous prime is 8377943144803. The next prime is 8377943144863. The reversal of 8377943144861 is 1684413497738.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8330323612900 + 47619531961 = 2886230^2 + 218219^2 .

It is a cyclic number.

It is not a de Polignac number, because 8377943144861 - 2³⁰ = 8376869403037 is a prime.

Together with 8377943144863, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8377943144863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4188971572430 + 4188971572431.

It is an arithmetic number, because the mean of its divisors is an integer number (4188971572431).

Almost surely, 2^{8377943144861} is an apocalyptic number.

It is an amenable number.

8377943144861 is a deficient number, since it is larger than the sum of its proper divisors (1).

8377943144861 is an equidigital number, since it uses as much as digits as its factorization.

8377943144861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 97542144, while the sum is 65.

The spelling of 8377943144861 in words is "eight trillion, three hundred seventy-seven billion, nine hundred forty-three million, one hundred forty-four thousand, eight hundred sixty-one".