81040510167 has 16 divisors (see below), whose sum is σ = 108915381120. Its totient is φ = 53596923552.

The previous prime is 81040510141. The next prime is 81040510207. The reversal of 81040510167 is 76101504018.

It is a happy number.

It is not a de Polignac number, because 81040510167 - 2¹⁹ = 81039985879 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81040510367) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 470673 + ... + 619365.

It is an arithmetic number, because the mean of its divisors is an integer number (6807211320).

Almost surely, 2^81040510167 is an apocalyptic number.

81040510167 is a deficient number, since it is larger than the sum of its proper divisors (27874870953).

81040510167 is a wasteful number, since it uses less digits than its factorization.

81040510167 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 150142.

The product of its (nonzero) digits is 6720, while the sum is 33.

The spelling of 81040510167 in words is "eighty-one billion, forty million, five hundred ten thousand, one hundred sixty-seven".