1266996998400 has 864 divisors, whose sum is σ = 5163507014400. Its totient is φ = 272539975680.

The previous prime is 1266996998327. The next prime is 1266996998419. The reversal of 1266996998400 is 48996996621.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 111949542 + ... + 111960858.

Almost surely, 2^{1266996998400} is an apocalyptic number.

1266996998400 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 1266996998400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2581753507200).

1266996998400 is an abundant number, since it is smaller than the sum of its proper divisors (3896510016000).

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

1266996998400 is a wasteful number, since it uses less digits than its factorization.

1266996998400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11384 (or 11351 counting only the distinct ones).

The product of its (nonzero) digits is 90699264, while the sum is 69.

The spelling of 1266996998400 in words is "one trillion, two hundred sixty-six billion, nine hundred ninety-six million, nine hundred ninety-eight thousand, four hundred".