666515073 has 16 divisors (see below), whose sum is σ = 1075386240. Its totient is φ = 358461696.

The previous prime is 666515063. The next prime is 666515089. The reversal of 666515073 is 370515666.

666515073 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 666515073 - 2¹⁴ = 666498689 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (666515023) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 933138 + ... + 933851.

It is an arithmetic number, because the mean of its divisors is an integer number (67211640).

Almost surely, 2^666515073 is an apocalyptic number.

It is an amenable number.

666515073 is a deficient number, since it is larger than the sum of its proper divisors (408871167).

666515073 is a wasteful number, since it uses less digits than its factorization.

666515073 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1867016.

The product of its (nonzero) digits is 113400, while the sum is 39.

The square root of 666515073 is about 25816.9532090834. The cubic root of 666515073 is about 873.5142450839.

The spelling of 666515073 in words is "six hundred sixty-six million, five hundred fifteen thousand, seventy-three".