81066473 has 2 divisors, whose sum is σ = 81066474. Its totient is φ = 81066472.

The previous prime is 81066409. The next prime is 81066527. The reversal of 81066473 is 37466018.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 80766169 + 300304 = 8987^2 + 548^2 .

It is a cyclic number.

It is not a de Polignac number, because 81066473 - 2⁶ = 81066409 is a prime.

It is not a weakly prime, because it can be changed into another prime (81066173) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40533236 + 40533237.

It is an arithmetic number, because the mean of its divisors is an integer number (40533237).

Almost surely, 2^81066473 is an apocalyptic number.

It is an amenable number.

81066473 is a deficient number, since it is larger than the sum of its proper divisors (1).

81066473 is an equidigital number, since it uses as much as digits as its factorization.

81066473 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24192, while the sum is 35.

The square root of 81066473 is about 9003.6921870975. The cubic root of 81066473 is about 432.7931975639.

The spelling of 81066473 in words is "eighty-one million, sixty-six thousand, four hundred seventy-three".