81527631584 has 48 divisors (see below), whose sum is σ = 187180812000. Its totient is φ = 34940408832.

The previous prime is 81527631541. The next prime is 81527631587. The reversal of 81527631584 is 48513672518.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81527631587) 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, 3702929 + ... + 3724880.

It is an arithmetic number, because the mean of its divisors is an integer number (3899600250).

Almost surely, 2^81527631584 is an apocalyptic number.

It is an amenable number.

81527631584 is an abundant number, since it is smaller than the sum of its proper divisors (105653180416).

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

81527631584 is an equidigital number, since it uses as much as digits as its factorization.

81527631584 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7427840 (or 7427818 counting only the distinct ones).

The product of its digits is 1612800, while the sum is 50.

The spelling of 81527631584 in words is "eighty-one billion, five hundred twenty-seven million, six hundred thirty-one thousand, five hundred eighty-four".