81116706492 has 36 divisors (see below), whose sum is σ = 206520164760. Its totient is φ = 26844376032.

The previous prime is 81116706491. The next prime is 81116706497. The reversal of 81116706492 is 29460761118.

81116706492 is a `hidden beast` number, since 81 + 1 + 16 + 70 + 6 + 492 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81116706491) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8100183 + ... + 8110190.

Almost surely, 2^81116706492 is an apocalyptic number.

It is an amenable number.

81116706492 is an abundant number, since it is smaller than the sum of its proper divisors (125403458268).

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

81116706492 is a wasteful number, since it uses less digits than its factorization.

81116706492 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16210522 (or 16210517 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 45.

The spelling of 81116706492 in words is "eighty-one billion, one hundred sixteen million, seven hundred six thousand, four hundred ninety-two".