666171562 has 12 divisors (see below), whose sum is σ = 1162401570. Its totient is φ = 285502056.

The previous prime is 666171551. The next prime is 666171587. The reversal of 666171562 is 265171666.

It can be written as a sum of positive squares in only one way, i.e., 666104481 + 67081 = 25809^2 + 259^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3398737 + ... + 3398932.

Almost surely, 2^666171562 is an apocalyptic number.

666171562 is a deficient number, since it is larger than the sum of its proper divisors (496230008).

666171562 is a wasteful number, since it uses less digits than its factorization.

666171562 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6797685 (or 6797678 counting only the distinct ones).

The product of its digits is 90720, while the sum is 40.

The square root of 666171562 is about 25810.2995333258. The cubic root of 666171562 is about 873.3641542969.

The spelling of 666171562 in words is "six hundred sixty-six million, one hundred seventy-one thousand, five hundred sixty-two".