81088113553 has 4 divisors (see below), whose sum is σ = 81089412388. Its totient is φ = 81086814720.

The previous prime is 81088113503. The next prime is 81088113577. The reversal of 81088113553 is 35531188018.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 62886595984 + 18201517569 = 250772^2 + 134913^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81088113553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81088113503) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 550776 + ... + 682297.

It is an arithmetic number, because the mean of its divisors is an integer number (20272353097).

Almost surely, 2^81088113553 is an apocalyptic number.

It is an amenable number.

81088113553 is a deficient number, since it is larger than the sum of its proper divisors (1298835).

81088113553 is a wasteful number, since it uses less digits than its factorization.

81088113553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1298834.

The product of its (nonzero) digits is 115200, while the sum is 43.

The spelling of 81088113553 in words is "eighty-one billion, eighty-eight million, one hundred thirteen thousand, five hundred fifty-three".