81699887167 has 16 divisors (see below), whose sum is σ = 83262722400. Its totient is φ = 80147865600.

The previous prime is 81699887149. The next prime is 81699887233. The reversal of 81699887167 is 76178899618.

It is not a de Polignac number, because 81699887167 - 2¹⁹ = 81699362879 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 81699887096 and 81699887105.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81699887567) 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, 19046559 + ... + 19050847.

It is an arithmetic number, because the mean of its divisors is an integer number (5203920150).

Almost surely, 2^81699887167 is an apocalyptic number.

81699887167 is a deficient number, since it is larger than the sum of its proper divisors (1562835233).

81699887167 is a wasteful number, since it uses less digits than its factorization.

81699887167 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5466.

The product of its digits is 73156608, while the sum is 70.

The spelling of 81699887167 in words is "eighty-one billion, six hundred ninety-nine million, eight hundred eighty-seven thousand, one hundred sixty-seven".