81737067020 has 48 divisors (see below), whose sum is σ = 198532470528. Its totient is φ = 27686493120.

The previous prime is 81737067019. The next prime is 81737067023. The reversal of 81737067020 is 2076073718.

It is not an unprimeable number, because it can be changed into a prime (81737067023) 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, 3505466 + ... + 3528705.

It is an arithmetic number, because the mean of its divisors is an integer number (4136093136).

Almost surely, 2^81737067020 is an apocalyptic number.

It is an amenable number.

81737067020 is an abundant number, since it is smaller than the sum of its proper divisors (116795403508).

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

81737067020 is a wasteful number, since it uses less digits than its factorization.

81737067020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7034270 (or 7034268 counting only the distinct ones).

The product of its (nonzero) digits is 98784, while the sum is 41.

The spelling of 81737067020 in words is "eighty-one billion, seven hundred thirty-seven million, sixty-seven thousand, twenty".