81180496924605 has 48 divisors (see below), whose sum is σ = 151782531067440. Its totient is φ = 39901008559104.

The previous prime is 81180496924601. The next prime is 81180496924609. The reversal of 81180496924605 is 50642969408118.

81180496924605 is a `hidden beast` number, since 8 + 1 + 1 + 80 + 4 + 9 + 6 + 92 + 460 + 5 = 666.

It is an interprime number because it is at equal distance from previous prime (81180496924601) and next prime (81180496924609).

It can be written as a sum of positive squares in 8 ways, for example, as 22553941311801 + 58626555612804 = 4749099^2 + 7656798^2 .

It is not a de Polignac number, because 81180496924605 - 2² = 81180496924601 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81180496924601) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 112094550 + ... + 112816439.

It is an arithmetic number, because the mean of its divisors is an integer number (3162136063905).

Almost surely, 2^{81180496924605} is an apocalyptic number.

It is an amenable number.

81180496924605 is a deficient number, since it is larger than the sum of its proper divisors (70602034142835).

81180496924605 is a wasteful number, since it uses less digits than its factorization.

81180496924605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 224911630 (or 224911627 counting only the distinct ones).

The product of its (nonzero) digits is 29859840, while the sum is 63.

The spelling of 81180496924605 in words is "eighty-one trillion, one hundred eighty billion, four hundred ninety-six million, nine hundred twenty-four thousand, six hundred five".