81566095 has 8 divisors (see below), whose sum is σ = 105408576. Its totient is φ = 60233376.

The previous prime is 81566087. The next prime is 81566129. The reversal of 81566095 is 59066518.

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 81566095 - 2³ = 81566087 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 627367 + ... + 627496.

It is an arithmetic number, because the mean of its divisors is an integer number (13176072).

Almost surely, 2^81566095 is an apocalyptic number.

81566095 is a deficient number, since it is larger than the sum of its proper divisors (23842481).

81566095 is a wasteful number, since it uses less digits than its factorization.

81566095 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1254881.

The product of its (nonzero) digits is 64800, while the sum is 40.

The square root of 81566095 is about 9031.3949642345. The cubic root of 81566095 is about 433.6804953036.

The spelling of 81566095 in words is "eighty-one million, five hundred sixty-six thousand, ninety-five".