1366555812 has 24 divisors (see below), whose sum is σ = 3376197216. Its totient is φ = 428723328.

The previous prime is 1366555811. The next prime is 1366555831. The reversal of 1366555812 is 2185556631.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (1366555811) 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 7 ways as a sum of consecutive naturals, for example, 3349198 + ... + 3349605.

It is an arithmetic number, because the mean of its divisors is an integer number (140674884).

Almost surely, 2^1366555812 is an apocalyptic number.

1366555812 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1366555812 is an abundant number, since it is smaller than the sum of its proper divisors (2009641404).

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

1366555812 is a wasteful number, since it uses less digits than its factorization.

1366555812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6698827 (or 6698825 counting only the distinct ones).

The product of its digits is 216000, while the sum is 42.

The square root of 1366555812 is about 36966.9556766580. The cubic root of 1366555812 is about 1109.7090415057.

The spelling of 1366555812 in words is "one billion, three hundred sixty-six million, five hundred fifty-five thousand, eight hundred twelve".