1366646386 has 16 divisors (see below), whose sum is σ = 2366977536. Its totient is φ = 579666816.

The previous prime is 1366646381. The next prime is 1366646387. The reversal of 1366646386 is 6836466631.

It is a super-4 number, since 4×1366646386⁴ (a number of 38 digits) contains 4444 as substring.

It is not an unprimeable number, because it can be changed into a prime (1366646381) 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, 501826 + ... + 504541.

It is an arithmetic number, because the mean of its divisors is an integer number (147936096).

Almost surely, 2^1366646386 is an apocalyptic number.

1366646386 is a deficient number, since it is larger than the sum of its proper divisors (1000331150).

1366646386 is a wasteful number, since it uses less digits than its factorization.

1366646386 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1006473.

The product of its digits is 2239488, while the sum is 49.

The square root of 1366646386 is about 36968.1807234275. The cubic root of 1366646386 is about 1109.7335577787.

The spelling of 1366646386 in words is "one billion, three hundred sixty-six million, six hundred forty-six thousand, three hundred eighty-six".