81030137472 has 48 divisors (see below), whose sum is σ = 233172664530. Its totient is φ = 27010045440.

The previous prime is 81030137467. The next prime is 81030137521. The reversal of 81030137472 is 27473103018.

It can be written as a sum of positive squares in only one way, i.e., 80215834176 + 814303296 = 283224^2 + 28536^2 .

It is a tau number, because it is divible by the number of its divisors (48).

It is a Harshad number since it is a multiple of its sum of digits (36).

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 5 ways as a sum of consecutive naturals, for example, 35168179 + ... + 35170482.

Almost surely, 2^81030137472 is an apocalyptic number.

It is an amenable number.

81030137472 is an abundant number, since it is smaller than the sum of its proper divisors (152142527058).

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

81030137472 is a wasteful number, since it uses less digits than its factorization.

81030137472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70338681 (or 70338666 counting only the distinct ones).

The product of its (nonzero) digits is 28224, while the sum is 36.

The spelling of 81030137472 in words is "eighty-one billion, thirty million, one hundred thirty-seven thousand, four hundred seventy-two".