7727286661 has 2 divisors, whose sum is σ = 7727286662. Its totient is φ = 7727286660.

The previous prime is 7727286631. The next prime is 7727286673. The reversal of 7727286661 is 1666827277.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5729733025 + 1997553636 = 75695^2 + 44694^2 .

It is an emirp because it is prime and its reverse (1666827277) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7727286661 - 2¹¹ = 7727284613 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 7727286599 and 7727286608.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7727286631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3863643330 + 3863643331.

It is an arithmetic number, because the mean of its divisors is an integer number (3863643331).

Almost surely, 2^7727286661 is an apocalyptic number.

It is an amenable number.

7727286661 is a deficient number, since it is larger than the sum of its proper divisors (1).

7727286661 is an equidigital number, since it uses as much as digits as its factorization.

7727286661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2370816, while the sum is 52.

The square root of 7727286661 is about 87904.9865536649. The cubic root of 7727286661 is about 1977.0106457210.

The spelling of 7727286661 in words is "seven billion, seven hundred twenty-seven million, two hundred eighty-six thousand, six hundred sixty-one".