1356345666 has 144 divisors (see below), whose sum is σ = 3462301440. Its totient is φ = 382112640.

The previous prime is 1356345643. The next prime is 1356345701. The reversal of 1356345666 is 6665436531.

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 71 ways as a sum of consecutive naturals, for example, 1791360 + ... + 1792116.

It is an arithmetic number, because the mean of its divisors is an integer number (24043760).

Almost surely, 2^1356345666 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1356345666, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1731150720).

1356345666 is an abundant number, since it is smaller than the sum of its proper divisors (2105955774).

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

1356345666 is a wasteful number, since it uses less digits than its factorization.

1356345666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 841 (or 825 counting only the distinct ones).

The product of its digits is 1166400, while the sum is 45.

The square root of 1356345666 is about 36828.5984799856. The cubic root of 1356345666 is about 1106.9384199605.

The spelling of 1356345666 in words is "one billion, three hundred fifty-six million, three hundred forty-five thousand, six hundred sixty-six".