181500665540428 has 12 divisors (see below), whose sum is σ = 342058946595520. Its totient is φ = 83769537941712.

The previous prime is 181500665540347. The next prime is 181500665540437. The reversal of 181500665540428 is 824045566005181.

It is a happy number.

It is a super-2 number, since 2×181500665540428² (a number of 29 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1745198707068 + ... + 1745198707171.

Almost surely, 2^{181500665540428} is an apocalyptic number.

It is an amenable number.

181500665540428 is a deficient number, since it is larger than the sum of its proper divisors (160558281055092).

181500665540428 is a wasteful number, since it uses less digits than its factorization.

181500665540428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3490397414256 (or 3490397414254 counting only the distinct ones).

The product of its (nonzero) digits is 9216000, while the sum is 55.

The spelling of 181500665540428 in words is "one hundred eighty-one trillion, five hundred billion, six hundred sixty-five million, five hundred forty thousand, four hundred twenty-eight".