2623311661 has 2 divisors, whose sum is σ = 2623311662. Its totient is φ = 2623311660.

The previous prime is 2623311583. The next prime is 2623311673. The reversal of 2623311661 is 1661133262.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2585722500 + 37589161 = 50850^2 + 6131^2 .

It is a cyclic number.

It is not a de Polignac number, because 2623311661 - 2¹³ = 2623303469 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2623315661) 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, 1311655830 + 1311655831.

It is an arithmetic number, because the mean of its divisors is an integer number (1311655831).

Almost surely, 2^2623311661 is an apocalyptic number.

It is an amenable number.

2623311661 is a deficient number, since it is larger than the sum of its proper divisors (1).

2623311661 is an equidigital number, since it uses as much as digits as its factorization.

2623311661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7776, while the sum is 31.

The square root of 2623311661 is about 51218.2746780873. The cubic root of 2623311661 is about 1379.1662787759.

The spelling of 2623311661 in words is "two billion, six hundred twenty-three million, three hundred eleven thousand, six hundred sixty-one".