81498971213961 has 24 divisors (see below), whose sum is σ = 133842248048160. Its totient is φ = 43831379475072.

The previous prime is 81498971213923. The next prime is 81498971213981. The reversal of 81498971213961 is 16931217989418.

It is not a de Polignac number, because 81498971213961 - 2¹¹ = 81498971211913 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81498971213911) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 16306314271 + ... + 16306319268.

It is an arithmetic number, because the mean of its divisors is an integer number (5576760335340).

Almost surely, 2^{81498971213961} is an apocalyptic number.

It is an amenable number.

81498971213961 is a deficient number, since it is larger than the sum of its proper divisors (52343276834199).

81498971213961 is a wasteful number, since it uses less digits than its factorization.

81498971213961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32612633573 (or 32612633566 counting only the distinct ones).

The product of its digits is 47029248, while the sum is 69.

The spelling of 81498971213961 in words is "eighty-one trillion, four hundred ninety-eight billion, nine hundred seventy-one million, two hundred thirteen thousand, nine hundred sixty-one".