666634441 has 16 divisors (see below), whose sum is σ = 739041408. Its totient is φ = 596272000.

The previous prime is 666634433. The next prime is 666634487. The reversal of 666634441 is 144436666.

It is a cyclic number.

It is not a de Polignac number, because 666634441 - 2³ = 666634433 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 666634394 and 666634403.

It is not an unprimeable number, because it can be changed into a prime (666634411) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 183741 + ... + 187333.

It is an arithmetic number, because the mean of its divisors is an integer number (46190088).

Almost surely, 2^666634441 is an apocalyptic number.

It is an amenable number.

666634441 is a deficient number, since it is larger than the sum of its proper divisors (72406967).

666634441 is a wasteful number, since it uses less digits than its factorization.

666634441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3872.

The product of its digits is 248832, while the sum is 40.

The square root of 666634441 is about 25819.2649198229. The cubic root of 666634441 is about 873.5663886531.

The spelling of 666634441 in words is "six hundred sixty-six million, six hundred thirty-four thousand, four hundred forty-one".