666212110 has 16 divisors (see below), whose sum is σ = 1218841632. Its totient is φ = 262116000.

The previous prime is 666212087. The next prime is 666212111. The reversal of 666212110 is 11212666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666212111) 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, 545466 + ... + 546685.

It is an arithmetic number, because the mean of its divisors is an integer number (76177602).

Almost surely, 2^666212110 is an apocalyptic number.

666212110 is a deficient number, since it is larger than the sum of its proper divisors (552629522).

666212110 is a wasteful number, since it uses less digits than its factorization.

666212110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1092219.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 666212110 is about 25811.0850217499. The cubic root of 666212110 is about 873.3818736820.

Adding to 666212110 its reverse (11212666), we get a palindrome (677424776).

The spelling of 666212110 in words is "six hundred sixty-six million, two hundred twelve thousand, one hundred ten".