81275487163 has 4 divisors (see below), whose sum is σ = 87527447728. Its totient is φ = 75023526600.

The previous prime is 81275487157. The next prime is 81275487233. The reversal of 81275487163 is 36178457218.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 36178457218 = 2 ⋅18089228609.

It is a cyclic number.

It is not a de Polignac number, because 81275487163 - 2¹⁷ = 81275356091 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 81275487163.

It is not an unprimeable number, because it can be changed into a prime (81275487133) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3125980263 + ... + 3125980288.

It is an arithmetic number, because the mean of its divisors is an integer number (21881861932).

Almost surely, 2^81275487163 is an apocalyptic number.

81275487163 is a deficient number, since it is larger than the sum of its proper divisors (6251960565).

81275487163 is a wasteful number, since it uses less digits than its factorization.

81275487163 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6251960564.

The product of its digits is 2257920, while the sum is 52.

The spelling of 81275487163 in words is "eighty-one billion, two hundred seventy-five million, four hundred eighty-seven thousand, one hundred sixty-three".