81633406216 has 32 divisors (see below), whose sum is σ = 163523340000. Its totient is φ = 38091309696.

The previous prime is 81633406199. The next prime is 81633406243. The reversal of 81633406216 is 61260433618.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3997741 + ... + 4018108.

It is an arithmetic number, because the mean of its divisors is an integer number (5110104375).

Almost surely, 2^81633406216 is an apocalyptic number.

It is an amenable number.

81633406216 is an abundant number, since it is smaller than the sum of its proper divisors (81889933784).

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

81633406216 is a wasteful number, since it uses less digits than its factorization.

81633406216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8015941 (or 8015937 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 40.

The spelling of 81633406216 in words is "eighty-one billion, six hundred thirty-three million, four hundred six thousand, two hundred sixteen".