81011475080 has 32 divisors (see below), whose sum is σ = 182744429400. Its totient is φ = 32321281536.

The previous prime is 81011475073. The next prime is 81011475101. The reversal of 81011475080 is 8057411018.

It can be written as a sum of positive squares in 4 ways, for example, as 57104749156 + 23906725924 = 238966^2 + 154618^2 .

It is a super-3 number, since 3×81011475080³ (a number of 34 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a self number, because there is not a number n which added to its sum of digits gives 81011475080.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2587637 + ... + 2618756.

Almost surely, 2^81011475080 is an apocalyptic number.

It is an amenable number.

81011475080 is an abundant number, since it is smaller than the sum of its proper divisors (101732954320).

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

81011475080 is a wasteful number, since it uses less digits than its factorization.

81011475080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5206793 (or 5206789 counting only the distinct ones).

The product of its (nonzero) digits is 8960, while the sum is 35.

Adding to 81011475080 its reverse (8057411018), we get a palindrome (89068886098).

The spelling of 81011475080 in words is "eighty-one billion, eleven million, four hundred seventy-five thousand, eighty".