720011666 has 8 divisors (see below), whose sum is σ = 1178200944. Its totient is φ = 327278020.

The previous prime is 720011627. The next prime is 720011671. The reversal of 720011666 is 666110027.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16363880 + ... + 16363923.

It is an arithmetic number, because the mean of its divisors is an integer number (147275118).

Almost surely, 2^720011666 is an apocalyptic number.

720011666 is a deficient number, since it is larger than the sum of its proper divisors (458189278).

720011666 is a wasteful number, since it uses less digits than its factorization.

720011666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32727816.

The product of its (nonzero) digits is 3024, while the sum is 29.

The square root of 720011666 is about 26833.0331121921. The cubic root of 720011666 is about 896.2857900323.

The spelling of 720011666 in words is "seven hundred twenty million, eleven thousand, six hundred sixty-six".