81623470085 has 8 divisors (see below), whose sum is σ = 97950755616. Its totient is φ = 65297048400.

The previous prime is 81623470067. The next prime is 81623470087. The reversal of 81623470085 is 58007432618.

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

It is not a de Polignac number, because 81623470085 - 2²² = 81619275781 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81623470087) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14222 + ... + 404288.

It is an arithmetic number, because the mean of its divisors is an integer number (12243844452).

Almost surely, 2^81623470085 is an apocalyptic number.

It is an amenable number.

81623470085 is a deficient number, since it is larger than the sum of its proper divisors (16327285531).

81623470085 is a wasteful number, since it uses less digits than its factorization.

81623470085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 431923.

The product of its (nonzero) digits is 322560, while the sum is 44.

The spelling of 81623470085 in words is "eighty-one billion, six hundred twenty-three million, four hundred seventy thousand, eighty-five".