666545441 has 8 divisors (see below), whose sum is σ = 702564000. Its totient is φ = 630620640.

The previous prime is 666545431. The next prime is 666545459. The reversal of 666545441 is 144545666.

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

It is a de Polignac number, because none of the positive numbers 2^k-666545441 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (666545431) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8591 + ... + 37508.

It is an arithmetic number, because the mean of its divisors is an integer number (87820500).

Almost surely, 2^666545441 is an apocalyptic number.

It is an amenable number.

666545441 is a deficient number, since it is larger than the sum of its proper divisors (36018559).

666545441 is a wasteful number, since it uses less digits than its factorization.

666545441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46879.

The product of its digits is 345600, while the sum is 41.

The square root of 666545441 is about 25817.5413430481. The cubic root of 666545441 is about 873.5275113394.

The spelling of 666545441 in words is "six hundred sixty-six million, five hundred forty-five thousand, four hundred forty-one".