666005787 has 32 divisors (see below), whose sum is σ = 1057996800. Its totient is φ = 412573824.

The previous prime is 666005777. The next prime is 666005789. The reversal of 666005787 is 787500666.

It is not a de Polignac number, because 666005787 - 2¹² = 666001691 is a prime.

It is not an unprimeable number, because it can be changed into a prime (666005789) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 27078 + ... + 45444.

It is an arithmetic number, because the mean of its divisors is an integer number (33062400).

Almost surely, 2^666005787 is an apocalyptic number.

666005787 is a deficient number, since it is larger than the sum of its proper divisors (391991013).

666005787 is a wasteful number, since it uses less digits than its factorization.

666005787 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18472 (or 18466 counting only the distinct ones).

The product of its (nonzero) digits is 423360, while the sum is 45.

The square root of 666005787 is about 25807.0879217319. The cubic root of 666005787 is about 873.2917035139.

The spelling of 666005787 in words is "six hundred sixty-six million, five thousand, seven hundred eighty-seven".