81499883152 has 40 divisors (see below), whose sum is σ = 160318651896. Its totient is φ = 40131926016.

The previous prime is 81499883147. The next prime is 81499883177. The reversal of 81499883152 is 25138899418.

It can be written as a sum of positive squares in 4 ways, for example, as 8082729216 + 73417153936 = 89904^2 + 270956^2 .

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 140298 + ... + 427414.

Almost surely, 2^81499883152 is an apocalyptic number.

It is an amenable number.

81499883152 is a deficient number, since it is larger than the sum of its proper divisors (78818768744).

81499883152 is a wasteful number, since it uses less digits than its factorization.

81499883152 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 287395 (or 287389 counting only the distinct ones).

The product of its digits is 4976640, while the sum is 58.

The spelling of 81499883152 in words is "eighty-one billion, four hundred ninety-nine million, eight hundred eighty-three thousand, one hundred fifty-two".