81641059016 has 32 divisors (see below), whose sum is σ = 168373205280. Its totient is φ = 37109567440.

The previous prime is 81641059013. The next prime is 81641059067. The reversal of 81641059016 is 61095014618.

It is not an unprimeable number, because it can be changed into a prime (81641059013) 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, 3822986 + ... + 3844281.

It is an arithmetic number, because the mean of its divisors is an integer number (5261662665).

Almost surely, 2^81641059016 is an apocalyptic number.

It is an amenable number.

81641059016 is an abundant number, since it is smaller than the sum of its proper divisors (86732146264).

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

81641059016 is a wasteful number, since it uses less digits than its factorization.

81641059016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7667306 (or 7667280 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 41.

The spelling of 81641059016 in words is "eighty-one billion, six hundred forty-one million, fifty-nine thousand, sixteen".