81800610583 has 4 divisors (see below), whose sum is σ = 83702950408. Its totient is φ = 79898270760.

The previous prime is 81800610571. The next prime is 81800610599. The reversal of 81800610583 is 38501600818.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 81800610583 - 2¹⁷ = 81800479511 is a prime.

It is a super-2 number, since 2×81800610583² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81800610883) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 951169848 + ... + 951169933.

It is an arithmetic number, because the mean of its divisors is an integer number (20925737602).

Almost surely, 2^81800610583 is an apocalyptic number.

81800610583 is a deficient number, since it is larger than the sum of its proper divisors (1902339825).

81800610583 is a wasteful number, since it uses less digits than its factorization.

81800610583 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1902339824.

The product of its (nonzero) digits is 46080, while the sum is 40.

The spelling of 81800610583 in words is "eighty-one billion, eight hundred million, six hundred ten thousand, five hundred eighty-three".