666521146 has 8 divisors (see below), whose sum is σ = 1007654400. Its totient is φ = 330636348.

The previous prime is 666521143. The next prime is 666521153. The reversal of 666521146 is 641125666.

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 (666521143) 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, 1311796 + ... + 1312303.

It is an arithmetic number, because the mean of its divisors is an integer number (125956800).

Almost surely, 2^666521146 is an apocalyptic number.

666521146 is a deficient number, since it is larger than the sum of its proper divisors (341133254).

666521146 is a wasteful number, since it uses less digits than its factorization.

666521146 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2624228.

The product of its digits is 51840, while the sum is 37.

The square root of 666521146 is about 25817.0708253280. The cubic root of 666521146 is about 873.5168981051.

The spelling of 666521146 in words is "six hundred sixty-six million, five hundred twenty-one thousand, one hundred forty-six".