2661844849 has 2 divisors, whose sum is σ = 2661844850. Its totient is φ = 2661844848.

The previous prime is 2661844847. The next prime is 2661844873. The reversal of 2661844849 is 9484481662.

2661844849 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1474560000 + 1187284849 = 38400^2 + 34457^2 .

It is a cyclic number.

It is not a de Polignac number, because 2661844849 - 2¹ = 2661844847 is a prime.

Together with 2661844847, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 2661844796 and 2661844805.

It is not a weakly prime, because it can be changed into another prime (2661844847) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1330922424 + 1330922425.

It is an arithmetic number, because the mean of its divisors is an integer number (1330922425).

Almost surely, 2^2661844849 is an apocalyptic number.

It is an amenable number.

2661844849 is a deficient number, since it is larger than the sum of its proper divisors (1).

2661844849 is an equidigital number, since it uses as much as digits as its factorization.

2661844849 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2654208, while the sum is 52.

The square root of 2661844849 is about 51593.0697768605. The cubic root of 2661844849 is about 1385.8862290154.

The spelling of 2661844849 in words is "two billion, six hundred sixty-one million, eight hundred forty-four thousand, eight hundred forty-nine".