718072666 has 8 divisors (see below), whose sum is σ = 1077494580. Its totient is φ = 358907808.

The previous prime is 718072661. The next prime is 718072669. The reversal of 718072666 is 666270817.

It can be written as a sum of positive squares in 2 ways, for example, as 698492041 + 19580625 = 26429^2 + 4425^2 .

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

It is not an unprimeable number, because it can be changed into a prime (718072661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 57121 + ... + 68548.

Almost surely, 2^718072666 is an apocalyptic number.

718072666 is a deficient number, since it is larger than the sum of its proper divisors (359421914).

718072666 is a wasteful number, since it uses less digits than its factorization.

718072666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128528.

The product of its (nonzero) digits is 169344, while the sum is 43.

The square root of 718072666 is about 26796.8779151602. The cubic root of 718072666 is about 895.4804972723.

The spelling of 718072666 in words is "seven hundred eighteen million, seventy-two thousand, six hundred sixty-six".