81760161616 has 40 divisors (see below), whose sum is σ = 181138100864. Its totient is φ = 35021151360.

The previous prime is 81760161599. The next prime is 81760161617. The reversal of 81760161616 is 61616106718.

81760161616 is a modest number, since divided by 161616 gives 81760 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81760161617) 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, 12301 + ... + 404563.

Almost surely, 2^81760161616 is an apocalyptic number.

It is an amenable number.

81760161616 is an abundant number, since it is smaller than the sum of its proper divisors (99377939248).

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

81760161616 is a wasteful number, since it uses less digits than its factorization.

81760161616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 394139 (or 394133 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 43.

The spelling of 81760161616 in words is "eighty-one billion, seven hundred sixty million, one hundred sixty-one thousand, six hundred sixteen".