81975576255 has 24 divisors (see below), whose sum is σ = 134801653392. Its totient is φ = 42538666752.

The previous prime is 81975576217. The next prime is 81975576281. The reversal of 81975576255 is 55267557918.

It is not a de Polignac number, because 81975576255 - 2⁹ = 81975575743 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1975462 + ... + 2016531.

It is an arithmetic number, because the mean of its divisors is an integer number (5616735558).

Almost surely, 2^81975576255 is an apocalyptic number.

81975576255 is a deficient number, since it is larger than the sum of its proper divisors (52826077137).

81975576255 is a wasteful number, since it uses less digits than its factorization.

81975576255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3992075 (or 3992038 counting only the distinct ones).

The product of its digits is 26460000, while the sum is 60.

The spelling of 81975576255 in words is "eighty-one billion, nine hundred seventy-five million, five hundred seventy-six thousand, two hundred fifty-five".