7727140661 has 2 divisors, whose sum is σ = 7727140662. Its totient is φ = 7727140660.

The previous prime is 7727140639. The next prime is 7727140709. The reversal of 7727140661 is 1660417277.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7429405636 + 297735025 = 86194^2 + 17255^2 .

It is a cyclic number.

It is not a de Polignac number, because 7727140661 - 2¹⁸ = 7726878517 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7727140361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3863570330 + 3863570331.

It is an arithmetic number, because the mean of its divisors is an integer number (3863570331).

Almost surely, 2^7727140661 is an apocalyptic number.

It is an amenable number.

7727140661 is a deficient number, since it is larger than the sum of its proper divisors (1).

7727140661 is an equidigital number, since it uses as much as digits as its factorization.

7727140661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 98784, while the sum is 41.

The square root of 7727140661 is about 87904.1561076608. The cubic root of 7727140661 is about 1976.9981943745.

The spelling of 7727140661 in words is "seven billion, seven hundred twenty-seven million, one hundred forty thousand, six hundred sixty-one".