81275181732 has 48 divisors (see below), whose sum is σ = 210890393280. Its totient is φ = 27068975424.

The previous prime is 81275181709. The next prime is 81275181733. The reversal of 81275181732 is 23718157218.

81275181732 is a `hidden beast` number, since 8 + 127 + 518 + 1 + 7 + 3 + 2 = 666.

It is not an unprimeable number, because it can be changed into a prime (81275181733) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 186558 + ... + 444245.

It is an arithmetic number, because the mean of its divisors is an integer number (4393549860).

Almost surely, 2^81275181732 is an apocalyptic number.

It is an amenable number.

81275181732 is an abundant number, since it is smaller than the sum of its proper divisors (129615211548).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81275181732 is a wasteful number, since it uses less digits than its factorization.

81275181732 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 632009 (or 632001 counting only the distinct ones).

The product of its digits is 188160, while the sum is 45.

The spelling of 81275181732 in words is "eighty-one billion, two hundred seventy-five million, one hundred eighty-one thousand, seven hundred thirty-two".