7091249208661 has 2 divisors, whose sum is σ = 7091249208662. Its totient is φ = 7091249208660.

The previous prime is 7091249208653. The next prime is 7091249208691. The reversal of 7091249208661 is 1668029421907.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6527539559025 + 563709649636 = 2554905^2 + 750806^2 .

It is a cyclic number.

It is not a de Polignac number, because 7091249208661 - 2³ = 7091249208653 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7091249208691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3545624604330 + 3545624604331.

It is an arithmetic number, because the mean of its divisors is an integer number (3545624604331).

Almost surely, 2^{7091249208661} is an apocalyptic number.

It is an amenable number.

7091249208661 is a deficient number, since it is larger than the sum of its proper divisors (1).

7091249208661 is an equidigital number, since it uses as much as digits as its factorization.

7091249208661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2612736, while the sum is 55.

The spelling of 7091249208661 in words is "seven trillion, ninety-one billion, two hundred forty-nine million, two hundred eight thousand, six hundred sixty-one".