1266939648000 has 576 divisors, whose sum is σ = 4918019652000. Its totient is φ = 311854694400.

The previous prime is 1266939647971. The next prime is 1266939648019. The reversal of 1266939648000 is 8469396621.

1266939648000 is a `hidden beast` number, since 12 + 6 + 69 + 3 + 96 + 480 + 0 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (576).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 29930851 + ... + 29973149.

Almost surely, 2^{1266939648000} is an apocalyptic number.

1266939648000 is a gapful number since it is divisible by the number (10) 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 1266939648000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2459009826000).

1266939648000 is an abundant number, since it is smaller than the sum of its proper divisors (3651080004000).

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

1266939648000 is a wasteful number, since it uses less digits than its factorization.

1266939648000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42355 (or 42322 counting only the distinct ones).

The product of its (nonzero) digits is 3359232, while the sum is 54.

The spelling of 1266939648000 in words is "one trillion, two hundred sixty-six billion, nine hundred thirty-nine million, six hundred forty-eight thousand".