81826305603 has 24 divisors (see below), whose sum is σ = 130344630528. Its totient is φ = 44724931152.

The previous prime is 81826305593. The next prime is 81826305611. The reversal of 81826305603 is 30650362818.

It is not a de Polignac number, because 81826305603 - 2¹⁰ = 81826304579 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81826305643) 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 23 ways as a sum of consecutive naturals, for example, 3671775 + ... + 3693992.

It is an arithmetic number, because the mean of its divisors is an integer number (5431026272).

Almost surely, 2^81826305603 is an apocalyptic number.

81826305603 is a deficient number, since it is larger than the sum of its proper divisors (48518324925).

81826305603 is a wasteful number, since it uses less digits than its factorization.

81826305603 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7365823 (or 7365800 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 42.

The spelling of 81826305603 in words is "eighty-one billion, eight hundred twenty-six million, three hundred five thousand, six hundred three".