668252155 has 16 divisors (see below), whose sum is σ = 813309120. Its totient is φ = 527044608.

The previous prime is 668252107. The next prime is 668252209. The reversal of 668252155 is 551252866.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-668252155 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 117211 + ... + 122779.

It is an arithmetic number, because the mean of its divisors is an integer number (50831820).

Almost surely, 2^668252155 is an apocalyptic number.

668252155 is a deficient number, since it is larger than the sum of its proper divisors (145056965).

668252155 is a wasteful number, since it uses less digits than its factorization.

668252155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5910.

The product of its digits is 144000, while the sum is 40.

The square root of 668252155 is about 25850.5735913151. The cubic root of 668252155 is about 874.2724422822.

The spelling of 668252155 in words is "six hundred sixty-eight million, two hundred fifty-two thousand, one hundred fifty-five".