81003757573 has 16 divisors (see below), whose sum is σ = 81691758720. Its totient is φ = 80319859200.

The previous prime is 81003757517. The next prime is 81003757591. The reversal of 81003757573 is 37575730018.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 81003757573 - 2⁹ = 81003757061 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 (81003751573) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 62454061 + ... + 62455357.

It is an arithmetic number, because the mean of its divisors is an integer number (5105734920).

Almost surely, 2^81003757573 is an apocalyptic number.

It is an amenable number.

81003757573 is a deficient number, since it is larger than the sum of its proper divisors (688001147).

81003757573 is a wasteful number, since it uses less digits than its factorization.

81003757573 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2508.

The product of its (nonzero) digits is 617400, while the sum is 46.

It can be divided in two parts, 8100 and 3757573, that added together give a palindrome (3765673).

The spelling of 81003757573 in words is "eighty-one billion, three million, seven hundred fifty-seven thousand, five hundred seventy-three".