2079820661 has 2 divisors, whose sum is σ = 2079820662. Its totient is φ = 2079820660.

The previous prime is 2079820651. The next prime is 2079820669. The reversal of 2079820661 is 1660289702.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1754018161 + 325802500 = 41881^2 + 18050^2 .

It is a cyclic number.

It is not a de Polignac number, because 2079820661 - 2¹⁸ = 2079558517 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2079820669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1039910330 + 1039910331.

It is an arithmetic number, because the mean of its divisors is an integer number (1039910331).

Almost surely, 2^2079820661 is an apocalyptic number.

It is an amenable number.

2079820661 is a deficient number, since it is larger than the sum of its proper divisors (1).

2079820661 is an equidigital number, since it uses as much as digits as its factorization.

2079820661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72576, while the sum is 41.

The square root of 2079820661 is about 45605.0508277318. The cubic root of 2079820661 is about 1276.4641717964.

The spelling of 2079820661 in words is "two billion, seventy-nine million, eight hundred twenty thousand, six hundred sixty-one".