1266367885440 has 768 divisors, whose sum is σ = 4967470437120. Its totient is φ = 273043685376.

The previous prime is 1266367885427. The next prime is 1266367885493. The reversal of 1266367885440 is 445887636621.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (60).

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, 157956312 + ... + 157964328.

It is an arithmetic number, because the mean of its divisors is an integer number (6468060465).

Almost surely, 2^{1266367885440} is an apocalyptic number.

1266367885440 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 1266367885440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2483735218560).

1266367885440 is an abundant number, since it is smaller than the sum of its proper divisors (3701102551680).

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

1266367885440 is a wasteful number, since it uses less digits than its factorization.

1266367885440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8149 (or 8130 counting only the distinct ones).

The product of its (nonzero) digits is 46448640, while the sum is 60.

The spelling of 1266367885440 in words is "one trillion, two hundred sixty-six billion, three hundred sixty-seven million, eight hundred eighty-five thousand, four hundred forty".