81757041016 has 32 divisors (see below), whose sum is σ = 175213859040. Its totient is φ = 35034691968.

The previous prime is 81757041001. The next prime is 81757041029. The reversal of 81757041016 is 61014075718.

It is a self number, because there is not a number n which added to its sum of digits gives 81757041016.

It is a congruent number.

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, 434110 + ... + 593266.

It is an arithmetic number, because the mean of its divisors is an integer number (5475433095).

Almost surely, 2^81757041016 is an apocalyptic number.

It is an amenable number.

81757041016 is an abundant number, since it is smaller than the sum of its proper divisors (93456818024).

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

81757041016 is a wasteful number, since it uses less digits than its factorization.

81757041016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168343 (or 168339 counting only the distinct ones).

The product of its (nonzero) digits is 47040, while the sum is 40.

The spelling of 81757041016 in words is "eighty-one billion, seven hundred fifty-seven million, forty-one thousand, sixteen".