2757216661 has 2 divisors, whose sum is σ = 2757216662. Its totient is φ = 2757216660.

The previous prime is 2757216589. The next prime is 2757216697. The reversal of 2757216661 is 1666127572.

2757216661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2566942225 + 190274436 = 50665^2 + 13794^2 .

It is a cyclic number.

It is not a de Polignac number, because 2757216661 - 2¹¹ = 2757214613 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2757210661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1378608330 + 1378608331.

It is an arithmetic number, because the mean of its divisors is an integer number (1378608331).

Almost surely, 2^2757216661 is an apocalyptic number.

It is an amenable number.

2757216661 is a deficient number, since it is larger than the sum of its proper divisors (1).

2757216661 is an equidigital number, since it uses as much as digits as its factorization.

2757216661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 211680, while the sum is 43.

The square root of 2757216661 is about 52509.2054881808. The cubic root of 2757216661 is about 1402.2441323049.

The spelling of 2757216661 in words is "two billion, seven hundred fifty-seven million, two hundred sixteen thousand, six hundred sixty-one".