2071656661 has 2 divisors, whose sum is σ = 2071656662. Its totient is φ = 2071656660.

The previous prime is 2071656641. The next prime is 2071656689. The reversal of 2071656661 is 1666561702.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1098591025 + 973065636 = 33145^2 + 31194^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2071656661 is a prime.

It is a super-2 number, since 2×2071656661² = 8583522642131337842, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2071656641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1035828330 + 1035828331.

It is an arithmetic number, because the mean of its divisors is an integer number (1035828331).

Almost surely, 2^2071656661 is an apocalyptic number.

It is an amenable number.

2071656661 is a deficient number, since it is larger than the sum of its proper divisors (1).

2071656661 is an equidigital number, since it uses as much as digits as its factorization.

2071656661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 90720, while the sum is 40.

The square root of 2071656661 is about 45515.4551883204. The cubic root of 2071656661 is about 1274.7917970424.

It can be divided in two parts, 20716 and 56661, that added together give a palindrome (77377).

The spelling of 2071656661 in words is "two billion, seventy-one million, six hundred fifty-six thousand, six hundred sixty-one".