7426726666 has 4 divisors (see below), whose sum is σ = 11140090002. Its totient is φ = 3713363332.

The previous prime is 7426726627. The next prime is 7426726711. The reversal of 7426726666 is 6666276247.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6666276247 = 59 ⋅112987733.

It can be written as a sum of positive squares in only one way, i.e., 6598150441 + 828576225 = 81229^2 + 28785^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1856681665 + ... + 1856681668.

Almost surely, 2^7426726666 is an apocalyptic number.

7426726666 is a deficient number, since it is larger than the sum of its proper divisors (3713363336).

7426726666 is a wasteful number, since it uses less digits than its factorization.

7426726666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3713363335.

The product of its digits is 6096384, while the sum is 52.

The square root of 7426726666 is about 86178.4582479868. The cubic root of 7426726666 is about 1951.0383832722.

The spelling of 7426726666 in words is "seven billion, four hundred twenty-six million, seven hundred twenty-six thousand, six hundred sixty-six".