2661844847 has 2 divisors, whose sum is σ = 2661844848. Its totient is φ = 2661844846.

The previous prime is 2661844831. The next prime is 2661844849. The reversal of 2661844847 is 7484481662.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2661844847 - 2⁴ = 2661844831 is a prime.

Together with 2661844849, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 2661844795 and 2661844804.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2661844849) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1330922423 + 1330922424.

It is an arithmetic number, because the mean of its divisors is an integer number (1330922424).

Almost surely, 2^2661844847 is an apocalyptic number.

2661844847 is a deficient number, since it is larger than the sum of its proper divisors (1).

2661844847 is an equidigital number, since it uses as much as digits as its factorization.

2661844847 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2064384, while the sum is 50.

The square root of 2661844847 is about 51593.0697574781. The cubic root of 2661844847 is about 1385.8862286683.

The spelling of 2661844847 in words is "two billion, six hundred sixty-one million, eight hundred forty-four thousand, eight hundred forty-seven".