81512004554513 has 12 divisors (see below), whose sum is σ = 88308899643888. Its totient is φ = 75203982987120.

The previous prime is 81512004554417. The next prime is 81512004554569. The reversal of 81512004554513 is 31545540021518.

It is not a de Polignac number, because 81512004554513 - 2²² = 81512000360209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81512004553513) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 121032983 + ... + 121704588.

It is an arithmetic number, because the mean of its divisors is an integer number (7359074970324).

Almost surely, 2^{81512004554513} is an apocalyptic number.

It is an amenable number.

81512004554513 is a deficient number, since it is larger than the sum of its proper divisors (6796895089375).

81512004554513 is a wasteful number, since it uses less digits than its factorization.

81512004554513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 242739584 (or 242739571 counting only the distinct ones).

The product of its (nonzero) digits is 480000, while the sum is 44.

The spelling of 81512004554513 in words is "eighty-one trillion, five hundred twelve billion, four million, five hundred fifty-four thousand, five hundred thirteen".