81275507027 has 16 divisors (see below), whose sum is σ = 95629077600. Its totient is φ = 68099961600.

The previous prime is 81275506993. The next prime is 81275507063. The reversal of 81275507027 is 72070557218.

It is not a de Polignac number, because 81275507027 - 2¹⁰ = 81275506003 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81275707027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 335402 + ... + 524447.

It is an arithmetic number, because the mean of its divisors is an integer number (5976817350).

Almost surely, 2^81275507027 is an apocalyptic number.

81275507027 is a deficient number, since it is larger than the sum of its proper divisors (14353570573).

81275507027 is a wasteful number, since it uses less digits than its factorization.

81275507027 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 860534.

The product of its (nonzero) digits is 274400, while the sum is 44.

The spelling of 81275507027 in words is "eighty-one billion, two hundred seventy-five million, five hundred seven thousand, twenty-seven".