81633912852 has 12 divisors (see below), whose sum is σ = 190479130016. Its totient is φ = 27211304280.

The previous prime is 81633912821. The next prime is 81633912881. The reversal of 81633912852 is 25821933618.

It is a tau number, because it is divible by the number of its divisors (12).

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, 3401413024 + ... + 3401413047.

Almost surely, 2^81633912852 is an apocalyptic number.

It is an amenable number.

81633912852 is an abundant number, since it is smaller than the sum of its proper divisors (108845217164).

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

81633912852 is a wasteful number, since it uses less digits than its factorization.

81633912852 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6802826078 (or 6802826076 counting only the distinct ones).

The product of its digits is 622080, while the sum is 48.

The spelling of 81633912852 in words is "eighty-one billion, six hundred thirty-three million, nine hundred twelve thousand, eight hundred fifty-two".