81242722365 has 64 divisors (see below), whose sum is σ = 155786457600. Its totient is φ = 35367542784.

The previous prime is 81242722331. The next prime is 81242722397. The reversal of 81242722365 is 56322724218.

It is not a de Polignac number, because 81242722365 - 2⁸ = 81242722109 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 39541 + ... + 405029.

It is an arithmetic number, because the mean of its divisors is an integer number (2434163400).

Almost surely, 2^81242722365 is an apocalyptic number.

It is an amenable number.

81242722365 is a deficient number, since it is larger than the sum of its proper divisors (74543735235).

81242722365 is a wasteful number, since it uses less digits than its factorization.

81242722365 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 365606.

The product of its digits is 322560, while the sum is 42.

The spelling of 81242722365 in words is "eighty-one billion, two hundred forty-two million, seven hundred twenty-two thousand, three hundred sixty-five".