81715199167 has 16 divisors (see below), whose sum is σ = 95794420480. Its totient is φ = 68245353792.

The previous prime is 81715199149. The next prime is 81715199179. The reversal of 81715199167 is 76199151718.

It is not a de Polignac number, because 81715199167 - 2⁷ = 81715199039 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81715197167) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 208773 + ... + 454990.

It is an arithmetic number, because the mean of its divisors is an integer number (5987151280).

Almost surely, 2^81715199167 is an apocalyptic number.

81715199167 is a deficient number, since it is larger than the sum of its proper divisors (14079221313).

81715199167 is a wasteful number, since it uses less digits than its factorization.

81715199167 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 664222.

The product of its digits is 952560, while the sum is 55.

The spelling of 81715199167 in words is "eighty-one billion, seven hundred fifteen million, one hundred ninety-nine thousand, one hundred sixty-seven".