1266961600000 has 120 divisors (see below), whose sum is σ = 3164112311976. Its totient is φ = 506784000000.

The previous prime is 1266961599977. The next prime is 1266961600039. The reversal of 1266961600000 is 61696621.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1204075 + ... + 1995925.

Almost surely, 2^{1266961600000} is an apocalyptic number.

1266961600000 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 1266961600000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1582056155988).

1266961600000 is an abundant number, since it is smaller than the sum of its proper divisors (1897150711976).

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

1266961600000 is an frugal number, since it uses more digits than its factorization.

1266961600000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 791894 (or 791858 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 37.

The spelling of 1266961600000 in words is "one trillion, two hundred sixty-six billion, nine hundred sixty-one million, six hundred thousand".