16668350181 has 20 divisors (see below), whose sum is σ = 28456725792. Its totient is φ = 9524771208.

The previous prime is 16668350177. The next prime is 16668350221. The reversal of 16668350181 is 18105386661.

It is not a de Polignac number, because 16668350181 - 2² = 16668350177 is a prime.

It is a super-2 number, since 2×16668350181² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16668350141) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 14698155 + ... + 14699288.

Almost surely, 2^16668350181 is an apocalyptic number.

It is an amenable number.

16668350181 is a deficient number, since it is larger than the sum of its proper divisors (11788375611).

16668350181 is an equidigital number, since it uses as much as digits as its factorization.

16668350181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29397462 (or 29397453 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 45.

The spelling of 16668350181 in words is "sixteen billion, six hundred sixty-eight million, three hundred fifty thousand, one hundred eighty-one".