8421419777 has 2 divisors, whose sum is σ = 8421419778. Its totient is φ = 8421419776.

The previous prime is 8421419737. The next prime is 8421419779. The reversal of 8421419777 is 7779141248.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7999692481 + 421727296 = 89441^2 + 20536^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8421419777 is a prime.

It is a super-2 number, since 2×8421419777² (a number of 21 digits) contains 22 as substring.

Together with 8421419779, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (8421419779) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4210709888 + 4210709889.

It is an arithmetic number, because the mean of its divisors is an integer number (4210709889).

Almost surely, 2^8421419777 is an apocalyptic number.

It is an amenable number.

8421419777 is a deficient number, since it is larger than the sum of its proper divisors (1).

8421419777 is an equidigital number, since it uses as much as digits as its factorization.

8421419777 is an evil number, because the sum of its binary digits is even.

The product of its digits is 790272, while the sum is 50.

The square root of 8421419777 is about 91768.2939636561. The cubic root of 8421419777 is about 2034.5191028626.

The spelling of 8421419777 in words is "eight billion, four hundred twenty-one million, four hundred nineteen thousand, seven hundred seventy-seven".