7266191689 has 2 divisors, whose sum is σ = 7266191690. Its totient is φ = 7266191688.

The previous prime is 7266191659. The next prime is 7266191719. The reversal of 7266191689 is 9861916627.

It is a balanced prime because it is at equal distance from previous prime (7266191659) and next prime (7266191719).

It can be written as a sum of positive squares in only one way, i.e., 5607014400 + 1659177289 = 74880^2 + 40733^2 .

It is a cyclic number.

It is not a de Polignac number, because 7266191689 - 2¹¹ = 7266189641 is a prime.

It is a super-2 number, since 2×7266191689² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (7266191659) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3633095844 + 3633095845.

It is an arithmetic number, because the mean of its divisors is an integer number (3633095845).

Almost surely, 2^7266191689 is an apocalyptic number.

It is an amenable number.

7266191689 is a deficient number, since it is larger than the sum of its proper divisors (1).

7266191689 is an equidigital number, since it uses as much as digits as its factorization.

7266191689 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1959552, while the sum is 55.

The square root of 7266191689 is about 85241.9596736255. The cubic root of 7266191689 is about 1936.8780773171.

The spelling of 7266191689 in words is "seven billion, two hundred sixty-six million, one hundred ninety-one thousand, six hundred eighty-nine".