726666261 has 8 divisors (see below), whose sum is σ = 969024864. Its totient is φ = 484375920.

The previous prime is 726666203. The next prime is 726666263. The reversal of 726666261 is 162666627.

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

It is not a de Polignac number, because 726666261 - 2¹⁵ = 726633493 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (726666263) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18171 + ... + 42231.

It is an arithmetic number, because the mean of its divisors is an integer number (121128108).

Almost surely, 2^726666261 is an apocalyptic number.

It is an amenable number.

726666261 is a deficient number, since it is larger than the sum of its proper divisors (242358603).

726666261 is a wasteful number, since it uses less digits than its factorization.

726666261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34131.

The product of its digits is 217728, while the sum is 42.

The square root of 726666261 is about 26956.7479678095. The cubic root of 726666261 is about 899.0385869292.

It can be divided in two parts, 72666626 and 1, that added together give a palindrome (72666627).

The spelling of 726666261 in words is "seven hundred twenty-six million, six hundred sixty-six thousand, two hundred sixty-one".