1266113640 has 192 divisors, whose sum is σ = 4374855360. Its totient is φ = 290672640.

The previous prime is 1266113617. The next prime is 1266113647. The reversal of 1266113640 is 463116621.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 1266113598 and 1266113607.

It is not an unprimeable number, because it can be changed into a prime (1266113647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 475192 + ... + 477848.

It is an arithmetic number, because the mean of its divisors is an integer number (22785705).

Almost surely, 2^1266113640 is an apocalyptic number.

1266113640 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 1266113640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2187427680).

1266113640 is an abundant number, since it is smaller than the sum of its proper divisors (3108741720).

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

1266113640 is a wasteful number, since it uses less digits than its factorization.

1266113640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2720 (or 2697 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 1266113640 is about 35582.4906379528. The cubic root of 1266113640 is about 1081.8263678842.

The spelling of 1266113640 in words is "one billion, two hundred sixty-six million, one hundred thirteen thousand, six hundred forty".