81156765076166 has 8 divisors (see below), whose sum is σ = 131099389738464. Its totient is φ = 37456968496680.

The previous prime is 81156765076151. The next prime is 81156765076229. The reversal of 81156765076166 is 66167056765118.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1560707020670 + ... + 1560707020721.

It is an arithmetic number, because the mean of its divisors is an integer number (16387423717308).

Almost surely, 2^{81156765076166} is an apocalyptic number.

81156765076166 is a deficient number, since it is larger than the sum of its proper divisors (49942624662298).

81156765076166 is a wasteful number, since it uses less digits than its factorization.

81156765076166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3121414041406.

The product of its (nonzero) digits is 76204800, while the sum is 65.

The spelling of 81156765076166 in words is "eighty-one trillion, one hundred fifty-six billion, seven hundred sixty-five million, seventy-six thousand, one hundred sixty-six".