81036850168 has 8 divisors (see below), whose sum is σ = 151944094080. Its totient is φ = 40518425080.

The previous prime is 81036850159. The next prime is 81036850211. The reversal of 81036850168 is 86105863018.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5064803128 + ... + 5064803143.

It is an arithmetic number, because the mean of its divisors is an integer number (18993011760).

Almost surely, 2^81036850168 is an apocalyptic number.

It is an amenable number.

81036850168 is a deficient number, since it is larger than the sum of its proper divisors (70907243912).

81036850168 is a wasteful number, since it uses less digits than its factorization.

81036850168 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10129606277 (or 10129606273 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 46.

The spelling of 81036850168 in words is "eighty-one billion, thirty-six million, eight hundred fifty thousand, one hundred sixty-eight".