81800260348 has 24 divisors (see below), whose sum is σ = 146510522928. Its totient is φ = 39940513536.

The previous prime is 81800260327. The next prime is 81800260351. The reversal of 81800260348 is 84306200818.

It is a super-2 number, since 2×81800260348² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 81800260348.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 807540 + ... + 903172.

It is an arithmetic number, because the mean of its divisors is an integer number (6104605122).

Almost surely, 2^81800260348 is an apocalyptic number.

It is an amenable number.

81800260348 is a deficient number, since it is larger than the sum of its proper divisors (64710262580).

81800260348 is a wasteful number, since it uses less digits than its factorization.

81800260348 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100653 (or 100651 counting only the distinct ones).

The product of its (nonzero) digits is 73728, while the sum is 40.

The spelling of 81800260348 in words is "eighty-one billion, eight hundred million, two hundred sixty thousand, three hundred forty-eight".