666403441 has 8 divisors (see below), whose sum is σ = 752054400. Its totient is φ = 584930640.

The previous prime is 666403433. The next prime is 666403453. The reversal of 666403441 is 144304666.

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

It is a cyclic number.

It is not a de Polignac number, because 666403441 - 2³ = 666403433 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 666403397 and 666403406.

It is not an unprimeable number, because it can be changed into a prime (666403421) 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, 1044201 + ... + 1044838.

It is an arithmetic number, because the mean of its divisors is an integer number (94006800).

Almost surely, 2^666403441 is an apocalyptic number.

It is an amenable number.

666403441 is a deficient number, since it is larger than the sum of its proper divisors (85650959).

666403441 is a wasteful number, since it uses less digits than its factorization.

666403441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2089079.

The product of its (nonzero) digits is 41472, while the sum is 34.

The square root of 666403441 is about 25814.7911283435. The cubic root of 666403441 is about 873.4654752008.

The spelling of 666403441 in words is "six hundred sixty-six million, four hundred three thousand, four hundred forty-one".