666541595 has 4 divisors (see below), whose sum is σ = 799849920. Its totient is φ = 533233272.

The previous prime is 666541583. The next prime is 666541607. The reversal of 666541595 is 595145666.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (666541583) and next prime (666541607).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-666541595 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66654155 + ... + 66654164.

It is an arithmetic number, because the mean of its divisors is an integer number (199962480).

Almost surely, 2^666541595 is an apocalyptic number.

666541595 is a deficient number, since it is larger than the sum of its proper divisors (133308325).

666541595 is a wasteful number, since it uses less digits than its factorization.

666541595 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133308324.

The product of its digits is 972000, while the sum is 47.

The square root of 666541595 is about 25817.4668586986. The cubic root of 666541595 is about 873.5258312373.

The spelling of 666541595 in words is "six hundred sixty-six million, five hundred forty-one thousand, five hundred ninety-five".