16660561976 has 16 divisors (see below), whose sum is σ = 31241552040. Its totient is φ = 8329481440.

The previous prime is 16660561961. The next prime is 16660561999. The reversal of 16660561976 is 67916506661.

It is a super-2 number, since 2×16660561976² (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 (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6215 + ... + 182646.

Almost surely, 2^16660561976 is an apocalyptic number.

It is an amenable number.

16660561976 is a deficient number, since it is larger than the sum of its proper divisors (14580990064).

16660561976 is a wasteful number, since it uses less digits than its factorization.

16660561976 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 199894 (or 199890 counting only the distinct ones).

The product of its (nonzero) digits is 2449440, while the sum is 53.

The spelling of 16660561976 in words is "sixteen billion, six hundred sixty million, five hundred sixty-one thousand, nine hundred seventy-six".