81066051 has 48 divisors (see below), whose sum is σ = 132612480. Its totient is φ = 47295360.

The previous prime is 81066031. The next prime is 81066067. The reversal of 81066051 is 15066018.

It is not a de Polignac number, because 81066051 - 2⁵ = 81066019 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81066031) 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 47 ways as a sum of consecutive naturals, for example, 583140 + ... + 583278.

It is an arithmetic number, because the mean of its divisors is an integer number (2762760).

Almost surely, 2^81066051 is an apocalyptic number.

81066051 is a deficient number, since it is larger than the sum of its proper divisors (51546429).

81066051 is a wasteful number, since it uses less digits than its factorization.

81066051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 336 (or 333 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 27.

The square root of 81066051 is about 9003.6687522365. The cubic root of 81066051 is about 432.7924465792.

The spelling of 81066051 in words is "eighty-one million, sixty-six thousand, fifty-one".