16668186663 has 8 divisors (see below), whose sum is σ = 22340606976. Its totient is φ = 11053945400.

The previous prime is 16668186659. The next prime is 16668186719. The reversal of 16668186663 is 36668186661.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 16668186663 - 2² = 16668186659 is a prime.

It is a super-2 number, since 2×16668186663² (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 (16668186263) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14544093 + ... + 14545238.

It is an arithmetic number, because the mean of its divisors is an integer number (2792575872).

Almost surely, 2^16668186663 is an apocalyptic number.

16668186663 is a deficient number, since it is larger than the sum of its proper divisors (5672420313).

16668186663 is a wasteful number, since it uses less digits than its factorization.

16668186663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29089525.

The product of its digits is 8957952, while the sum is 57.

The spelling of 16668186663 in words is "sixteen billion, six hundred sixty-eight million, one hundred eighty-six thousand, six hundred sixty-three".