16581364 has 6 divisors (see below), whose sum is σ = 29017394. Its totient is φ = 8290680.

The previous prime is 16581349. The next prime is 16581371. The reversal of 16581364 is 46318561.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 16080100 + 501264 = 4010^2 + 708^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2072667 + ... + 2072674.

Almost surely, 2^16581364 is an apocalyptic number.

It is an amenable number.

16581364 is a deficient number, since it is larger than the sum of its proper divisors (12436030).

16581364 is a wasteful number, since it uses less digits than its factorization.

16581364 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4145345 (or 4145343 counting only the distinct ones).

The product of its digits is 17280, while the sum is 34.

The square root of 16581364 is about 4072.0221021011. The cubic root of 16581364 is about 254.9999436114. Note that the first 4 decimals are identical.

The spelling of 16581364 in words is "sixteen million, five hundred eighty-one thousand, three hundred sixty-four".