181823734136 has 32 divisors (see below), whose sum is σ = 379825217280. Its totient is φ = 80888700000.

The previous prime is 181823734121. The next prime is 181823734153. The reversal of 181823734136 is 631437328181.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (47).

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, 21976490 + ... + 21984761.

It is an arithmetic number, because the mean of its divisors is an integer number (11869538040).

Almost surely, 2^181823734136 is an apocalyptic number.

It is an amenable number.

181823734136 is an abundant number, since it is smaller than the sum of its proper divisors (198001483144).

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

181823734136 is a wasteful number, since it uses less digits than its factorization.

181823734136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43961315 (or 43961311 counting only the distinct ones).

The product of its digits is 580608, while the sum is 47.

The spelling of 181823734136 in words is "one hundred eighty-one billion, eight hundred twenty-three million, seven hundred thirty-four thousand, one hundred thirty-six".