666432445 has 16 divisors (see below), whose sum is σ = 924238080. Its totient is φ = 451845504.

The previous prime is 666432443. The next prime is 666432523. The reversal of 666432445 is 544234666.

666432445 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 666432445 - 2¹ = 666432443 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 666432398 and 666432407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666432443) 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, 103857 + ... + 110086.

It is an arithmetic number, because the mean of its divisors is an integer number (57764880).

Almost surely, 2^666432445 is an apocalyptic number.

It is an amenable number.

666432445 is a deficient number, since it is larger than the sum of its proper divisors (257805635).

666432445 is a wasteful number, since it uses less digits than its factorization.

666432445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 214044.

The product of its digits is 414720, while the sum is 40.

The square root of 666432445 is about 25815.3528931913. The cubic root of 666432445 is about 873.4781470166.

The spelling of 666432445 in words is "six hundred sixty-six million, four hundred thirty-two thousand, four hundred forty-five".