81366203 has 8 divisors (see below), whose sum is σ = 85860000. Its totient is φ = 76952128.

The previous prime is 81366193. The next prime is 81366217. The reversal of 81366203 is 30266318.

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

It is a cyclic number.

It is not a de Polignac number, because 81366203 - 2⁶ = 81366139 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81366223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17828 + ... + 21921.

It is an arithmetic number, because the mean of its divisors is an integer number (10732500).

Almost surely, 2^81366203 is an apocalyptic number.

81366203 is a deficient number, since it is larger than the sum of its proper divisors (4493797).

81366203 is a wasteful number, since it uses less digits than its factorization.

81366203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39861.

The product of its (nonzero) digits is 5184, while the sum is 29.

The square root of 81366203 is about 9020.3216683220. The cubic root of 81366203 is about 433.3259355082.

The spelling of 81366203 in words is "eighty-one million, three hundred sixty-six thousand, two hundred three".