2706921661 has 2 divisors, whose sum is σ = 2706921662. Its totient is φ = 2706921660.

The previous prime is 2706921601. The next prime is 2706921677. The reversal of 2706921661 is 1661296072.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2134994436 + 571927225 = 46206^2 + 23915^2 .

It is a cyclic number.

It is not a de Polignac number, because 2706921661 - 2⁷ = 2706921533 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2706921601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1353460830 + 1353460831.

It is an arithmetic number, because the mean of its divisors is an integer number (1353460831).

Almost surely, 2^2706921661 is an apocalyptic number.

It is an amenable number.

2706921661 is a deficient number, since it is larger than the sum of its proper divisors (1).

2706921661 is an equidigital number, since it uses as much as digits as its factorization.

2706921661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 54432, while the sum is 40.

The square root of 2706921661 is about 52028.0853097632. The cubic root of 2706921661 is about 1393.6655422931.

The spelling of 2706921661 in words is "two billion, seven hundred six million, nine hundred twenty-one thousand, six hundred sixty-one".