2070720661 has 2 divisors, whose sum is σ = 2070720662. Its totient is φ = 2070720660.

The previous prime is 2070720647. The next prime is 2070720677. The reversal of 2070720661 is 1660270702.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1345495761 + 725224900 = 36681^2 + 26930^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2070720661 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2070720161) 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, 1035360330 + 1035360331.

It is an arithmetic number, because the mean of its divisors is an integer number (1035360331).

Almost surely, 2^2070720661 is an apocalyptic number.

It is an amenable number.

2070720661 is a deficient number, since it is larger than the sum of its proper divisors (1).

2070720661 is an equidigital number, since it uses as much as digits as its factorization.

2070720661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7056, while the sum is 31.

The square root of 2070720661 is about 45505.1718049718. The cubic root of 2070720661 is about 1274.5997792415.

The spelling of 2070720661 in words is "two billion, seventy million, seven hundred twenty thousand, six hundred sixty-one".