1321268166 has 32 divisors (see below), whose sum is σ = 3063813120. Its totient is φ = 421273512.

The previous prime is 1321268131. The next prime is 1321268171. The reversal of 1321268166 is 6618621231.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 1321268166.

It is a congruent number.

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, 530670 + ... + 533153.

It is an arithmetic number, because the mean of its divisors is an integer number (95744160).

Almost surely, 2^1321268166 is an apocalyptic number.

1321268166 is an abundant number, since it is smaller than the sum of its proper divisors (1742544954).

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

1321268166 is a wasteful number, since it uses less digits than its factorization.

1321268166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1063857 (or 1063851 counting only the distinct ones).

The product of its digits is 20736, while the sum is 36.

The square root of 1321268166 is about 36349.2526195519. The cubic root of 1321268166 is about 1097.3124932578.

Adding to 1321268166 its reverse (6618621231), we get a palindrome (7939889397).

The spelling of 1321268166 in words is "one billion, three hundred twenty-one million, two hundred sixty-eight thousand, one hundred sixty-six".