1266216876870 has 128 divisors (see below), whose sum is σ = 3464717856768. Its totient is φ = 293157744000.

The previous prime is 1266216876797. The next prime is 1266216876913. The reversal of 1266216876870 is 786786126621.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 4750645 + ... + 5010095.

It is an arithmetic number, because the mean of its divisors is an integer number (27068108256).

Almost surely, 2^{1266216876870} is an apocalyptic number.

1266216876870 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1266216876870, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1732358928384).

1266216876870 is an abundant number, since it is smaller than the sum of its proper divisors (2198500979898).

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

1266216876870 is a wasteful number, since it uses less digits than its factorization.

1266216876870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 260138.

The product of its (nonzero) digits is 16257024, while the sum is 60.

The spelling of 1266216876870 in words is "one trillion, two hundred sixty-six billion, two hundred sixteen million, eight hundred seventy-six thousand, eight hundred seventy".