666500445 has 48 divisors (see below), whose sum is σ = 1254070272. Its totient is φ = 325503360.

The previous prime is 666500423. The next prime is 666500477. The reversal of 666500445 is 544005666.

It is a happy number.

It is not a de Polignac number, because 666500445 - 2⁸ = 666500189 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 69810 + ... + 78780.

It is an arithmetic number, because the mean of its divisors is an integer number (26126464).

Almost surely, 2^666500445 is an apocalyptic number.

666500445 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

666500445 is a deficient number, since it is larger than the sum of its proper divisors (587569827).

666500445 is a wasteful number, since it uses less digits than its factorization.

666500445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9122 (or 9119 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 36.

The square root of 666500445 is about 25816.6699053151. The cubic root of 666500445 is about 873.5078547009.

The spelling of 666500445 in words is "six hundred sixty-six million, five hundred thousand, four hundred forty-five".