1366253568 has 280 divisors, whose sum is σ = 4281860880. Its totient is φ = 433520640.

The previous prime is 1366253531. The next prime is 1366253573. The reversal of 1366253568 is 8653526631.

1366253568 is a `hidden beast` number, since 1 + 3 + 66 + 25 + 3 + 568 = 666.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 19242973 + ... + 19243043.

Almost surely, 2^1366253568 is an apocalyptic number.

1366253568 is a gapful number since it is divisible by the number (18) 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 1366253568, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2140930440).

1366253568 is an abundant number, since it is smaller than the sum of its proper divisors (2915607312).

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

1366253568 is an frugal number, since it uses more digits than its factorization.

1366253568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138 (or 105 counting only the distinct ones).

The product of its digits is 777600, while the sum is 45.

The square root of 1366253568 is about 36962.8674212378. The cubic root of 1366253568 is about 1109.6272232521.

The spelling of 1366253568 in words is "one billion, three hundred sixty-six million, two hundred fifty-three thousand, five hundred sixty-eight".