81523041486 has 32 divisors (see below), whose sum is σ = 173799974400. Its totient is φ = 25418240640.

The previous prime is 81523041451. The next prime is 81523041487. The reversal of 81523041486 is 68414032518.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81523041487) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4517035 + ... + 4535046.

It is an arithmetic number, because the mean of its divisors is an integer number (5431249200).

Almost surely, 2^81523041486 is an apocalyptic number.

81523041486 is an abundant number, since it is smaller than the sum of its proper divisors (92276932914).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81523041486 is a wasteful number, since it uses less digits than its factorization.

81523041486 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9052184.

The product of its (nonzero) digits is 184320, while the sum is 42.

The spelling of 81523041486 in words is "eighty-one billion, five hundred twenty-three million, forty-one thousand, four hundred eighty-six".