666680075 has 24 divisors (see below), whose sum is σ = 921391920. Its totient is φ = 475545600.

The previous prime is 666680071. The next prime is 666680081. The reversal of 666680075 is 570086666.

It is not a de Polignac number, because 666680075 - 2² = 666680071 is a prime.

It is not an unprimeable number, because it can be changed into a prime (666680071) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 33206 + ... + 49355.

It is an arithmetic number, because the mean of its divisors is an integer number (38391330).

Almost surely, 2^666680075 is an apocalyptic number.

666680075 is a deficient number, since it is larger than the sum of its proper divisors (254711845).

666680075 is a wasteful number, since it uses less digits than its factorization.

666680075 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82607 (or 82602 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 44.

The square root of 666680075 is about 25820.1486246691. The cubic root of 666680075 is about 873.5863213261.

The spelling of 666680075 in words is "six hundred sixty-six million, six hundred eighty thousand, seventy-five".