27715581081 has 8 divisors (see below), whose sum is σ = 41060120160. Its totient is φ = 18477054036.

The previous prime is 27715581079. The next prime is 27715581133. The reversal of 27715581081 is 18018551772.

27715581081 is a `hidden beast` number, since 2 + 7 + 7 + 1 + 558 + 10 + 81 = 666.

It is not a de Polignac number, because 27715581081 - 2¹ = 27715581079 is a prime.

It is a super-2 number, since 2×27715581081² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (27715081081) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 513251475 + ... + 513251528.

It is an arithmetic number, because the mean of its divisors is an integer number (5132515020).

Almost surely, 2^27715581081 is an apocalyptic number.

It is an amenable number.

27715581081 is a deficient number, since it is larger than the sum of its proper divisors (13344539079).

27715581081 is a wasteful number, since it uses less digits than its factorization.

27715581081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1026503012 (or 1026503006 counting only the distinct ones).

The product of its (nonzero) digits is 156800, while the sum is 45.

The spelling of 27715581081 in words is "twenty-seven billion, seven hundred fifteen million, five hundred eighty-one thousand, eighty-one".