81513545218496 has 28 divisors (see below), whose sum is σ = 164167671768648. Its totient is φ = 40148462568192.

The previous prime is 81513545218487. The next prime is 81513545218517. The reversal of 81513545218496 is 69481254531518.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9504840071 + ... + 9504848646.

Almost surely, 2^{81513545218496} is an apocalyptic number.

It is an amenable number.

81513545218496 is an abundant number, since it is smaller than the sum of its proper divisors (82654126550152).

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

81513545218496 is a wasteful number, since it uses less digits than its factorization.

81513545218496 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19009688796 (or 19009688786 counting only the distinct ones).

The product of its digits is 41472000, while the sum is 62.

The spelling of 81513545218496 in words is "eighty-one trillion, five hundred thirteen billion, five hundred forty-five million, two hundred eighteen thousand, four hundred ninety-six".