181996290436 has 12 divisors (see below), whose sum is σ = 318898206928. Its totient is φ = 90882517032.

The previous prime is 181996290419. The next prime is 181996290481. The reversal of 181996290436 is 634092699181.

It is a hoax number, since the sum of its digits (58) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28903506 + ... + 28909801.

Almost surely, 2^181996290436 is an apocalyptic number.

It is an amenable number.

181996290436 is a deficient number, since it is larger than the sum of its proper divisors (136901916492).

181996290436 is a wasteful number, since it uses less digits than its factorization.

181996290436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57814098 (or 57814096 counting only the distinct ones).

The product of its (nonzero) digits is 5038848, while the sum is 58.

The spelling of 181996290436 in words is "one hundred eighty-one billion, nine hundred ninety-six million, two hundred ninety thousand, four hundred thirty-six".