81066403 has 8 divisors (see below), whose sum is σ = 89556480. Its totient is φ = 72763080.

The previous prime is 81066383. The next prime is 81066409. The reversal of 81066403 is 30466018.

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 81066403 - 2⁹ = 81065891 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81066409) 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, 45775 + ... + 47512.

It is an arithmetic number, because the mean of its divisors is an integer number (11194560).

Almost surely, 2^81066403 is an apocalyptic number.

81066403 is a deficient number, since it is larger than the sum of its proper divisors (8490077).

81066403 is a wasteful number, since it uses less digits than its factorization.

81066403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93377.

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 81066403 is about 9003.6882998025. The cubic root of 81066403 is about 432.7930729932.

The spelling of 81066403 in words is "eighty-one million, sixty-six thousand, four hundred three".