312111666 has 12 divisors (see below), whose sum is σ = 676241982. Its totient is φ = 104037216.

The previous prime is 312111649. The next prime is 312111671. The reversal of 312111666 is 666111213.

It can be written as a sum of positive squares in only one way, i.e., 266832225 + 45279441 = 16335^2 + 6729^2 .

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8669751 + ... + 8669786.

Almost surely, 2^312111666 is an apocalyptic number.

312111666 is an abundant number, since it is smaller than the sum of its proper divisors (364130316).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

312111666 is a wasteful number, since it uses less digits than its factorization.

312111666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17339545 (or 17339542 counting only the distinct ones).

The product of its digits is 1296, while the sum is 27.

The square root of 312111666 is about 17666.6823710622. The cubic root of 312111666 is about 678.3231941260.

Adding to 312111666 its reverse (666111213), we get a palindrome (978222879).

The spelling of 312111666 in words is "three hundred twelve million, one hundred eleven thousand, six hundred sixty-six".