81173560303 has 4 divisors (see below), whose sum is σ = 88552974888. Its totient is φ = 73794145720.

The previous prime is 81173560289. The next prime is 81173560309. The reversal of 81173560303 is 30306537118.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81173560303 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81173560309) 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, 3689707276 + ... + 3689707297.

It is an arithmetic number, because the mean of its divisors is an integer number (22138243722).

Almost surely, 2^81173560303 is an apocalyptic number.

81173560303 is a deficient number, since it is larger than the sum of its proper divisors (7379414585).

81173560303 is a wasteful number, since it uses less digits than its factorization.

81173560303 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7379414584.

The product of its (nonzero) digits is 45360, while the sum is 37.

The spelling of 81173560303 in words is "eighty-one billion, one hundred seventy-three million, five hundred sixty thousand, three hundred three".