81142253222096 has 40 divisors (see below), whose sum is σ = 171534501309504. Its totient is φ = 36876544680960.

The previous prime is 81142253222077. The next prime is 81142253222111. The reversal of 81142253222096 is 69022235224118.

It is a self number, because there is not a number n which added to its sum of digits gives 81142253222096.

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, 38326820 + ... + 40388483.

Almost surely, 2^{81142253222096} is an apocalyptic number.

It is an amenable number.

81142253222096 is an abundant number, since it is smaller than the sum of its proper divisors (90392248087408).

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

81142253222096 is a wasteful number, since it uses less digits than its factorization.

81142253222096 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78721179 (or 78721173 counting only the distinct ones).

The product of its (nonzero) digits is 829440, while the sum is 47.

The spelling of 81142253222096 in words is "eighty-one trillion, one hundred forty-two billion, two hundred fifty-three million, two hundred twenty-two thousand, ninety-six".