81754492194 has 12 divisors (see below), whose sum is σ = 177134733126. Its totient is φ = 27251497392.

The previous prime is 81754492189. The next prime is 81754492229. The reversal of 81754492194 is 49129445718.

81754492194 is a `hidden beast` number, since 8 + 1 + 7 + 5 + 449 + 2 + 194 = 666.

It can be written as a sum of positive squares in only one way, i.e., 76874771169 + 4879721025 = 277263^2 + 69855^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 81754492194.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2270958099 + ... + 2270958134.

Almost surely, 2^81754492194 is an apocalyptic number.

81754492194 is an abundant number, since it is smaller than the sum of its proper divisors (95380240932).

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

81754492194 is a wasteful number, since it uses less digits than its factorization.

81754492194 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4541916241 (or 4541916238 counting only the distinct ones).

The product of its digits is 2903040, while the sum is 54.

The spelling of 81754492194 in words is "eighty-one billion, seven hundred fifty-four million, four hundred ninety-two thousand, one hundred ninety-four".