726625666 has 16 divisors (see below), whose sum is σ = 1174940928. Its totient is φ = 335034000.

The previous prime is 726625649. The next prime is 726625667. The reversal of 726625666 is 666526627.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (726625667) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14031 + ... + 40621.

It is an arithmetic number, because the mean of its divisors is an integer number (73433808).

Almost surely, 2^726625666 is an apocalyptic number.

726625666 is a deficient number, since it is larger than the sum of its proper divisors (448315262).

726625666 is a wasteful number, since it uses less digits than its factorization.

726625666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27657.

The product of its digits is 1088640, while the sum is 46.

The square root of 726625666 is about 26955.9949918381. The cubic root of 726625666 is about 899.0218451074.

The spelling of 726625666 in words is "seven hundred twenty-six million, six hundred twenty-five thousand, six hundred sixty-six".