666587169 has 24 divisors (see below), whose sum is σ = 970482240. Its totient is φ = 440884512.

The previous prime is 666587167. The next prime is 666587179. The reversal of 666587169 is 961785666.

It is not a de Polignac number, because 666587169 - 2¹ = 666587167 is a prime.

It is a super-2 number, since 2×666587169² = 888676907750869122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (666587167) 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, 1036362 + ... + 1037004.

It is an arithmetic number, because the mean of its divisors is an integer number (40436760).

Almost surely, 2^666587169 is an apocalyptic number.

It is an amenable number.

666587169 is a deficient number, since it is larger than the sum of its proper divisors (303895071).

666587169 is a wasteful number, since it uses less digits than its factorization.

666587169 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1381 (or 1378 counting only the distinct ones).

The product of its digits is 3265920, while the sum is 54.

The square root of 666587169 is about 25818.3494631241. The cubic root of 666587169 is about 873.5457395517.

The spelling of 666587169 in words is "six hundred sixty-six million, five hundred eighty-seven thousand, one hundred sixty-nine".