81300585788 has 6 divisors (see below), whose sum is σ = 142276025136. Its totient is φ = 40650292892.

The previous prime is 81300585787. The next prime is 81300585791. The reversal of 81300585788 is 88758500318.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81300585787) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10162573220 + ... + 10162573227.

It is an arithmetic number, because the mean of its divisors is an integer number (23712670856).

Almost surely, 2^81300585788 is an apocalyptic number.

It is an amenable number.

81300585788 is a deficient number, since it is larger than the sum of its proper divisors (60975439348).

81300585788 is a wasteful number, since it uses less digits than its factorization.

81300585788 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20325146451 (or 20325146449 counting only the distinct ones).

The product of its (nonzero) digits is 2150400, while the sum is 53.

The spelling of 81300585788 in words is "eighty-one billion, three hundred million, five hundred eighty-five thousand, seven hundred eighty-eight".