81830356815 has 16 divisors (see below), whose sum is σ = 137819548800. Its totient is φ = 41345864352.

The previous prime is 81830356807. The next prime is 81830356877. The reversal of 81830356815 is 51865303818.

It is not a de Polignac number, because 81830356815 - 2³ = 81830356807 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 143561745 + ... + 143562314.

It is an arithmetic number, because the mean of its divisors is an integer number (8613721800).

Almost surely, 2^81830356815 is an apocalyptic number.

81830356815 is a deficient number, since it is larger than the sum of its proper divisors (55989191985).

81830356815 is a wasteful number, since it uses less digits than its factorization.

81830356815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 287124086.

The product of its (nonzero) digits is 691200, while the sum is 48.

The spelling of 81830356815 in words is "eighty-one billion, eight hundred thirty million, three hundred fifty-six thousand, eight hundred fifteen".