666155055 has 8 divisors (see below), whose sum is σ = 1065848112. Its totient is φ = 355282688.

The previous prime is 666155033. The next prime is 666155059. The reversal of 666155055 is 550551666.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 666155055 - 2⁵ = 666155023 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666155059) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 22205154 + ... + 22205183.

It is an arithmetic number, because the mean of its divisors is an integer number (133231014).

Almost surely, 2^666155055 is an apocalyptic number.

666155055 is a deficient number, since it is larger than the sum of its proper divisors (399693057).

666155055 is a wasteful number, since it uses less digits than its factorization.

666155055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44410345.

The product of its (nonzero) digits is 135000, while the sum is 39.

The square root of 666155055 is about 25809.9797559006. The cubic root of 666155055 is about 873.3569405690.

It can be divided in two parts, 6661 and 55055, that added together give a palindrome (61716).

The spelling of 666155055 in words is "six hundred sixty-six million, one hundred fifty-five thousand, fifty-five".