666378075 has 24 divisors (see below), whose sum is σ = 1201905216. Its totient is φ = 323092000.

The previous prime is 666378061. The next prime is 666378109. The reversal of 666378075 is 570873666.

It is not a de Polignac number, because 666378075 - 2⁴ = 666378059 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 403041 + ... + 404690.

It is an arithmetic number, because the mean of its divisors is an integer number (50079384).

Almost surely, 2^666378075 is an apocalyptic number.

666378075 is a deficient number, since it is larger than the sum of its proper divisors (535527141).

666378075 is a wasteful number, since it uses less digits than its factorization.

666378075 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 807755 (or 807750 counting only the distinct ones).

The product of its (nonzero) digits is 1270080, while the sum is 48.

The square root of 666378075 is about 25814.2998161872. The cubic root of 666378075 is about 873.4543925217.

The spelling of 666378075 in words is "six hundred sixty-six million, three hundred seventy-eight thousand, seventy-five".