1266666016 has 96 divisors (see below), whose sum is σ = 3118832640. Its totient is φ = 491961600.

The previous prime is 1266665993. The next prime is 1266666041. The reversal of 1266666016 is 6106666621.

It is a self number, because there is not a number n which added to its sum of digits gives 1266666016.

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, 1081111 + ... + 1082281.

It is an arithmetic number, because the mean of its divisors is an integer number (32487840).

Almost surely, 2^1266666016 is an apocalyptic number.

1266666016 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1266666016, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1559416320).

1266666016 is an abundant number, since it is smaller than the sum of its proper divisors (1852166624).

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

1266666016 is a wasteful number, since it uses less digits than its factorization.

1266666016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1638 (or 1630 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 40.

The square root of 1266666016 is about 35590.2516990257. The cubic root of 1266666016 is about 1081.9836702572.

The spelling of 1266666016 in words is "one billion, two hundred sixty-six million, six hundred sixty-six thousand, sixteen".