81313127166 has 16 divisors (see below), whose sum is σ = 162633881088. Its totient is φ = 27103104600.

The previous prime is 81313127153. The next prime is 81313127177. The reversal of 81313127166 is 66172131318.

It is a super-2 number, since 2×81313127166² (a number of 23 digits) contains 22 as substring.

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, 174190 + ... + 439281.

It is an arithmetic number, because the mean of its divisors is an integer number (10164617568).

Almost surely, 2^81313127166 is an apocalyptic number.

81313127166 is an abundant number, since it is smaller than the sum of its proper divisors (81320753922).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81313127166 is a wasteful number, since it uses less digits than its factorization.

81313127166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 635567.

The product of its digits is 36288, while the sum is 39.

The spelling of 81313127166 in words is "eighty-one billion, three hundred thirteen million, one hundred twenty-seven thousand, one hundred sixty-six".