1021667166 has 48 divisors (see below), whose sum is σ = 2402159760. Its totient is φ = 311950080.

The previous prime is 1021667161. The next prime is 1021667177. The reversal of 1021667166 is 6617661201.

It is a self number, because there is not a number n which added to its sum of digits gives 1021667166.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021667161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 13990 + ... + 47318.

It is an arithmetic number, because the mean of its divisors is an integer number (50044995).

Almost surely, 2^1021667166 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1021667166, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1201079880).

1021667166 is an abundant number, since it is smaller than the sum of its proper divisors (1380492594).

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

1021667166 is a wasteful number, since it uses less digits than its factorization.

1021667166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33481 (or 33478 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 36.

The square root of 1021667166 is about 31963.5286850498. The cubic root of 1021667166 is about 1007.1708447417.

The spelling of 1021667166 in words is "one billion, twenty-one million, six hundred sixty-seven thousand, one hundred sixty-six".