1366221844 has 48 divisors (see below), whose sum is σ = 2644200720. Its totient is φ = 613647360.

The previous prime is 1366221833. The next prime is 1366221851. The reversal of 1366221844 is 4481226631.

It can be written as a sum of positive squares in 8 ways, for example, as 573123600 + 793098244 = 23940^2 + 28162^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1647622 + ... + 1648450.

It is an arithmetic number, because the mean of its divisors is an integer number (55087515).

Almost surely, 2^1366221844 is an apocalyptic number.

It is an amenable number.

1366221844 is a deficient number, since it is larger than the sum of its proper divisors (1277978876).

1366221844 is a wasteful number, since it uses less digits than its factorization.

1366221844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1660 (or 1658 counting only the distinct ones).

The product of its digits is 55296, while the sum is 37.

The square root of 1366221844 is about 36962.4382853729. The cubic root of 1366221844 is about 1109.6186347813.

The spelling of 1366221844 in words is "one billion, three hundred sixty-six million, two hundred twenty-one thousand, eight hundred forty-four".