81066369 has 16 divisors (see below), whose sum is σ = 114382400. Its totient is φ = 50927616.

The previous prime is 81066367. The next prime is 81066383. The reversal of 81066369 is 96366018.

It is a happy number.

It is not a de Polignac number, because 81066369 - 2¹ = 81066367 is a prime.

It is a super-2 number, since 2×81066369² = 13143512365688322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81066367) by changing a digit.

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 in 15 ways as a sum of consecutive naturals, for example, 7317 + ... + 14685.

It is an arithmetic number, because the mean of its divisors is an integer number (7148900).

Almost surely, 2^81066369 is an apocalyptic number.

It is an amenable number.

81066369 is a deficient number, since it is larger than the sum of its proper divisors (33316031).

81066369 is a wasteful number, since it uses less digits than its factorization.

81066369 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7584.

The product of its (nonzero) digits is 46656, while the sum is 39.

The square root of 81066369 is about 9003.6864116872. The cubic root of 81066369 is about 432.7930124874.

The spelling of 81066369 in words is "eighty-one million, sixty-six thousand, three hundred sixty-nine".