101212311666 has 16 divisors (see below), whose sum is σ = 202427758944. Its totient is φ = 33736914624.

The previous prime is 101212311659. The next prime is 101212311667. The reversal of 101212311666 is 666113212101.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (101212311667) 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, 626490 + ... + 771306.

It is an arithmetic number, because the mean of its divisors is an integer number (12651734934).

Almost surely, 2^101212311666 is an apocalyptic number.

101212311666 is an abundant number, since it is smaller than the sum of its proper divisors (101215447278).

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

101212311666 is a wasteful number, since it uses less digits than its factorization.

101212311666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 261305.

The product of its (nonzero) digits is 2592, while the sum is 30.

Adding to 101212311666 its reverse (666113212101), we get a palindrome (767325523767).

The spelling of 101212311666 in words is "one hundred one billion, two hundred twelve million, three hundred eleven thousand, six hundred sixty-six".