81585202185814 has 8 divisors (see below), whose sum is σ = 129576497589288. Its totient is φ = 38393036322720.

The previous prime is 81585202185787. The next prime is 81585202185827. The reversal of 81585202185814 is 41858120258518.

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

It is a super-2 number, since 2×81585202185814² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1199782385052 + ... + 1199782385119.

It is an arithmetic number, because the mean of its divisors is an integer number (16197062198661).

Almost surely, 2^{81585202185814} is an apocalyptic number.

81585202185814 is a deficient number, since it is larger than the sum of its proper divisors (47991295403474).

81585202185814 is a wasteful number, since it uses less digits than its factorization.

81585202185814 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2399564770190.

The product of its (nonzero) digits is 8192000, while the sum is 58.

The spelling of 81585202185814 in words is "eighty-one trillion, five hundred eighty-five billion, two hundred two million, one hundred eighty-five thousand, eight hundred fourteen".