81126166 has 16 divisors (see below), whose sum is σ = 137330640. Its totient is φ = 35603680.

The previous prime is 81126151. The next prime is 81126169. The reversal of 81126166 is 66162118.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81126169) 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, 62941 + ... + 64216.

It is an arithmetic number, because the mean of its divisors is an integer number (8583165).

Almost surely, 2^81126166 is an apocalyptic number.

81126166 is a deficient number, since it is larger than the sum of its proper divisors (56204474).

81126166 is a wasteful number, since it uses less digits than its factorization.

81126166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127199.

The product of its digits is 3456, while the sum is 31.

The square root of 81126166 is about 9007.0064949460. The cubic root of 81126166 is about 432.8994000620.

The spelling of 81126166 in words is "eighty-one million, one hundred twenty-six thousand, one hundred sixty-six".