726536666 has 8 divisors (see below), whose sum is σ = 1099803540. Its totient is φ = 359935488.

The previous prime is 726536653. The next prime is 726536717. The reversal of 726536666 is 666635627.

726536666 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 725494225 + 1042441 = 26935^2 + 1021^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-4 number, since 4×726536666⁴ (a number of 37 digits) contains 4444 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 726536666.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1666151 + ... + 1666586.

Almost surely, 2^726536666 is an apocalyptic number.

726536666 is a deficient number, since it is larger than the sum of its proper divisors (373266874).

726536666 is a wasteful number, since it uses less digits than its factorization.

726536666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3332848.

The product of its digits is 1632960, while the sum is 47.

The square root of 726536666 is about 26954.3441025746. The cubic root of 726536666 is about 898.9851383523.

The spelling of 726536666 in words is "seven hundred twenty-six million, five hundred thirty-six thousand, six hundred sixty-six".