1266322560 has 128 divisors (see below), whose sum is σ = 4051978560. Its totient is φ = 336384000.

The previous prime is 1266322549. The next prime is 1266322573. The reversal of 1266322560 is 652236621.

It is a tau number, because it is divible by the number of its divisors (128).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 561435 + ... + 563685.

Almost surely, 2^1266322560 is an apocalyptic number.

1266322560 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 1266322560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2025989280).

1266322560 is an abundant number, since it is smaller than the sum of its proper divisors (2785656000).

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

1266322560 is a wasteful number, since it uses less digits than its factorization.

1266322560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2566 (or 2554 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 33.

The square root of 1266322560 is about 35585.4262304107. The cubic root of 1266322560 is about 1081.8858682658.

The spelling of 1266322560 in words is "one billion, two hundred sixty-six million, three hundred twenty-two thousand, five hundred sixty".