1266057216000 has 1064 divisors, whose sum is σ = 4827336900984. Its totient is φ = 331245158400.

The previous prime is 1266057215911. The next prime is 1266057216007. The reversal of 1266057216000 is 6127506621.

It is a happy number.

1266057216000 is a `hidden beast` number, since 1 + 26 + 6 + 0 + 5 + 7 + 21 + 600 + 0 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 12230590464 + 1253826625536 = 110592^2 + 1119744^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1266057216007) by changing a digit.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 23887871974 + ... + 23887872026.

Almost surely, 2^{1266057216000} is an apocalyptic number.

1266057216000 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 1266057216000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2413668450492).

1266057216000 is an abundant number, since it is smaller than the sum of its proper divisors (3561279684984).

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

1266057216000 is an frugal number, since it uses more digits than its factorization.

1266057216000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122 (or 63 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 36.

The spelling of 1266057216000 in words is "one trillion, two hundred sixty-six billion, fifty-seven million, two hundred sixteen thousand".