81753118443 has 12 divisors (see below), whose sum is σ = 118162455840. Its totient is φ = 54467639856.

The previous prime is 81753118339. The next prime is 81753118589. The reversal of 81753118443 is 34481135718.

81753118443 is a `hidden beast` number, since 8 + 175 + 31 + 1 + 8 + 443 = 666.

It is not a de Polignac number, because 81753118443 - 2⁹ = 81753117931 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81753138443) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2854888 + ... + 2883381.

It is an arithmetic number, because the mean of its divisors is an integer number (9846871320).

Almost surely, 2^81753118443 is an apocalyptic number.

81753118443 is a deficient number, since it is larger than the sum of its proper divisors (36409337397).

81753118443 is a wasteful number, since it uses less digits than its factorization.

81753118443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5739858 (or 5739855 counting only the distinct ones).

The product of its digits is 322560, while the sum is 45.

The spelling of 81753118443 in words is "eighty-one billion, seven hundred fifty-three million, one hundred eighteen thousand, four hundred forty-three".