1266329216 has 32 divisors (see below), whose sum is σ = 2632456800. Its totient is φ = 605634304.

The previous prime is 1266329153. The next prime is 1266329221. The reversal of 1266329216 is 6129236621.

It is a tau number, because it is divible by the number of its divisors (32).

It is a self number, because there is not a number n which added to its sum of digits gives 1266329216.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 212126 + ... + 218013.

It is an arithmetic number, because the mean of its divisors is an integer number (82264275).

Almost surely, 2^1266329216 is an apocalyptic number.

1266329216 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1266329216 is an abundant number, since it is smaller than the sum of its proper divisors (1366127584).

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

1266329216 is an equidigital number, since it uses as much as digits as its factorization.

1266329216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 430176 (or 430164 counting only the distinct ones).

The product of its digits is 46656, while the sum is 38.

The square root of 1266329216 is about 35585.5197517192. The cubic root of 1266329216 is about 1081.8877637860.

The spelling of 1266329216 in words is "one billion, two hundred sixty-six million, three hundred twenty-nine thousand, two hundred sixteen".