1265256720000 has 2560 divisors, whose sum is σ = 5920734758400. Its totient is φ = 258785280000.

The previous prime is 1265256719999. The next prime is 1265256720029. The reversal of 1265256720000 is 276525621.

1265256720000 is a `hidden beast` number, since 1 + 26 + 52 + 567 + 20 + 0 + 0 + 0 = 666.

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

It is an unprimeable number.

It is a polite number, since it can be written in 319 ways as a sum of consecutive naturals, for example, 8058959922 + ... + 8058960078.

It is an arithmetic number, because the mean of its divisors is an integer number (2312787015).

Almost surely, 2^{1265256720000} is an apocalyptic number.

1265256720000 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 1265256720000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2960367379200).

1265256720000 is an abundant number, since it is smaller than the sum of its proper divisors (4655478038400).

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

1265256720000 is a wasteful number, since it uses less digits than its factorization.

1265256720000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 261 (or 228 counting only the distinct ones).

The product of its (nonzero) digits is 50400, while the sum is 36.

The spelling of 1265256720000 in words is "one trillion, two hundred sixty-five billion, two hundred fifty-six million, seven hundred twenty thousand".