81504567127 has 4 divisors (see below), whose sum is σ = 81679095576. Its totient is φ = 81330038680.

The previous prime is 81504567091. The next prime is 81504567139. The reversal of 81504567127 is 72176540518.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 81504567127 - 2²⁷ = 81370349399 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81504567167) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 87263524 + ... + 87264457.

It is an arithmetic number, because the mean of its divisors is an integer number (20419773894).

Almost surely, 2^81504567127 is an apocalyptic number.

81504567127 is a deficient number, since it is larger than the sum of its proper divisors (174528449).

81504567127 is a wasteful number, since it uses less digits than its factorization.

81504567127 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 174528448.

The product of its (nonzero) digits is 470400, while the sum is 46.

The spelling of 81504567127 in words is "eighty-one billion, five hundred four million, five hundred sixty-seven thousand, one hundred twenty-seven".