2661337649 has 2 divisors, whose sum is σ = 2661337650. Its totient is φ = 2661337648.

The previous prime is 2661337531. The next prime is 2661337669. The reversal of 2661337649 is 9467331662.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2597737024 + 63600625 = 50968^2 + 7975^2 .

It is a cyclic number.

It is not a de Polignac number, because 2661337649 - 2²⁴ = 2644560433 is a prime.

It is not a weakly prime, because it can be changed into another prime (2661337669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1330668824 + 1330668825.

It is an arithmetic number, because the mean of its divisors is an integer number (1330668825).

Almost surely, 2^2661337649 is an apocalyptic number.

It is an amenable number.

2661337649 is a deficient number, since it is larger than the sum of its proper divisors (1).

2661337649 is an equidigital number, since it uses as much as digits as its factorization.

2661337649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 979776, while the sum is 47.

The square root of 2661337649 is about 51588.1541538365. The cubic root of 2661337649 is about 1385.7981990730.

The spelling of 2661337649 in words is "two billion, six hundred sixty-one million, three hundred thirty-seven thousand, six hundred forty-nine".