666100550 has 12 divisors (see below), whose sum is σ = 1238947116. Its totient is φ = 266440200.

The previous prime is 666100549. The next prime is 666100571. The reversal of 666100550 is 55001666.

It is a congruent number.

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, 6660956 + ... + 6661055.

It is an arithmetic number, because the mean of its divisors is an integer number (103245593).

Almost surely, 2^666100550 is an apocalyptic number.

666100550 is a deficient number, since it is larger than the sum of its proper divisors (572846566).

666100550 is a wasteful number, since it uses less digits than its factorization.

666100550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13322023 (or 13322018 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 29.

The square root of 666100550 is about 25808.9238442830. The cubic root of 666100550 is about 873.3331204798. Note that the first 3 decimals are identical.

The spelling of 666100550 in words is "six hundred sixty-six million, one hundred thousand, five hundred fifty".