81173295152 has 40 divisors (see below), whose sum is σ = 162371988480. Its totient is φ = 39271256640.

The previous prime is 81173295127. The next prime is 81173295157. The reversal of 81173295152 is 25159237118.

It is a super-3 number, since 3×81173295152³ (a number of 34 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (81173295157) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6115499 + ... + 6128757.

It is an arithmetic number, because the mean of its divisors is an integer number (4059299712).

Almost surely, 2^81173295152 is an apocalyptic number.

It is an amenable number.

81173295152 is an abundant number, since it is smaller than the sum of its proper divisors (81198693328).

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

81173295152 is a wasteful number, since it uses less digits than its factorization.

81173295152 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25641 (or 25635 counting only the distinct ones).

The product of its digits is 151200, while the sum is 44.

The spelling of 81173295152 in words is "eighty-one billion, one hundred seventy-three million, two hundred ninety-five thousand, one hundred fifty-two".