81548884518 has 32 divisors (see below), whose sum is σ = 168417134592. Its totient is φ = 26297006400.

The previous prime is 81548884477. The next prime is 81548884537.

It is a happy number.

81548884518 is nontrivially palindromic in base 10.

It is a super-2 number, since 2×81548884518² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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, 475023 + ... + 623493.

It is an arithmetic number, because the mean of its divisors is an integer number (5263035456).

Almost surely, 2^81548884518 is an apocalyptic number.

81548884518 is an abundant number, since it is smaller than the sum of its proper divisors (86868250074).

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

81548884518 is a wasteful number, since it uses less digits than its factorization.

81548884518 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151460.

The product of its digits is 13107200, while the sum is 60.

The spelling of 81548884518 in words is "eighty-one billion, five hundred forty-eight million, eight hundred eighty-four thousand, five hundred eighteen".