16661066558 has 8 divisors (see below), whose sum is σ = 25051246920. Its totient is φ = 8310650920.

The previous prime is 16661066507. The next prime is 16661066603. The reversal of 16661066558 is 85566016661.

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

It is a super-2 number, since 2×16661066558² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9940133 + ... + 9941808.

It is an arithmetic number, because the mean of its divisors is an integer number (3131405865).

Almost surely, 2^16661066558 is an apocalyptic number.

16661066558 is a deficient number, since it is larger than the sum of its proper divisors (8390180362).

16661066558 is a wasteful number, since it uses less digits than its factorization.

16661066558 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19882362.

The product of its (nonzero) digits is 1555200, while the sum is 50.

The spelling of 16661066558 in words is "sixteen billion, six hundred sixty-one million, sixty-six thousand, five hundred fifty-eight".