81830686495 has 8 divisors (see below), whose sum is σ = 98198788320. Its totient is φ = 65463239520.

The previous prime is 81830686493. The next prime is 81830686559. The reversal of 81830686495 is 59468603818.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 81830686495 - 2¹ = 81830686493 is a prime.

It is a super-2 number, since 2×81830686495² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81830686493) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 174865 + ... + 440725.

It is an arithmetic number, because the mean of its divisors is an integer number (12274848540).

Almost surely, 2^81830686495 is an apocalyptic number.

81830686495 is a deficient number, since it is larger than the sum of its proper divisors (16368101825).

81830686495 is a wasteful number, since it uses less digits than its factorization.

81830686495 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 327425.

The product of its (nonzero) digits is 9953280, while the sum is 58.

The spelling of 81830686495 in words is "eighty-one billion, eight hundred thirty million, six hundred eighty-six thousand, four hundred ninety-five".