2661611297 has 2 divisors, whose sum is σ = 2661611298. Its totient is φ = 2661611296.

The previous prime is 2661611261. The next prime is 2661611347. The reversal of 2661611297 is 7921161662.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2118208576 + 543402721 = 46024^2 + 23311^2 .

It is a cyclic number.

It is not a de Polignac number, because 2661611297 - 2¹⁸ = 2661349153 is a prime.

It is not a weakly prime, because it can be changed into another prime (2661616297) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1330805648 + 1330805649.

It is an arithmetic number, because the mean of its divisors is an integer number (1330805649).

Almost surely, 2^2661611297 is an apocalyptic number.

It is an amenable number.

2661611297 is a deficient number, since it is larger than the sum of its proper divisors (1).

2661611297 is an equidigital number, since it uses as much as digits as its factorization.

2661611297 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 54432, while the sum is 41.

The square root of 2661611297 is about 51590.8063224447. The cubic root of 2661611297 is about 1385.8456949766.

The spelling of 2661611297 in words is "two billion, six hundred sixty-one million, six hundred eleven thousand, two hundred ninety-seven".