666473065 has 8 divisors (see below), whose sum is σ = 800557128. Its totient is φ = 532652160.

The previous prime is 666473057. The next prime is 666473141. The reversal of 666473065 is 560374666.

It can be written as a sum of positive squares in 4 ways, for example, as 2277081 + 664195984 = 1509^2 + 25772^2 .

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

It is not a de Polignac number, because 666473065 - 2³ = 666473057 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 60172 + ... + 70381.

It is an arithmetic number, because the mean of its divisors is an integer number (100069641).

Almost surely, 2^666473065 is an apocalyptic number.

It is an amenable number.

666473065 is a deficient number, since it is larger than the sum of its proper divisors (134084063).

666473065 is a wasteful number, since it uses less digits than its factorization.

666473065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131579.

The product of its (nonzero) digits is 544320, while the sum is 43.

The square root of 666473065 is about 25816.1396223370. The cubic root of 666473065 is about 873.4958932322.

The spelling of 666473065 in words is "six hundred sixty-six million, four hundred seventy-three thousand, sixty-five".