81005366 has 8 divisors (see below), whose sum is σ = 130854864. Its totient is φ = 37387080.

The previous prime is 81005363. The next prime is 81005369. The reversal of 81005366 is 66350018.

81005366 is nontrivially palindromic in base 12.

It is an interprime number because it is at equal distance from previous prime (81005363) and next prime (81005369).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81005363) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1557770 + ... + 1557821.

It is an arithmetic number, because the mean of its divisors is an integer number (16356858).

Almost surely, 2^81005366 is an apocalyptic number.

81005366 is a deficient number, since it is larger than the sum of its proper divisors (49849498).

81005366 is a wasteful number, since it uses less digits than its factorization.

81005366 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3115606.

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 81005366 is about 9000.2981061740. The cubic root of 81005366 is about 432.6844253395.

The spelling of 81005366 in words is "eighty-one million, five thousand, three hundred sixty-six".