81516005615151 has 12 divisors (see below), whose sum is σ = 117746490941040. Its totient is φ = 54343473206400.

The previous prime is 81516005615129. The next prime is 81516005615221. The reversal of 81516005615151 is 15151650061518.

81516005615151 is a `hidden beast` number, since 8 + 1 + 5 + 16 + 0 + 0 + 5 + 615 + 15 + 1 = 666.

It is not a de Polignac number, because 81516005615151 - 2¹¹ = 81516005613103 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 81516005615097 and 81516005615106.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81516005615251) 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, 43237186 + ... + 45083103.

It is an arithmetic number, because the mean of its divisors is an integer number (9812207578420).

Almost surely, 2^{81516005615151} is an apocalyptic number.

81516005615151 is a deficient number, since it is larger than the sum of its proper divisors (36230485325889).

81516005615151 is a wasteful number, since it uses less digits than its factorization.

81516005615151 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88422846 (or 88422843 counting only the distinct ones).

The product of its (nonzero) digits is 180000, while the sum is 45.

Adding to 81516005615151 its reverse (15151650061518), we get a palindrome (96667655676669).

The spelling of 81516005615151 in words is "eighty-one trillion, five hundred sixteen billion, five million, six hundred fifteen thousand, one hundred fifty-one".