16616523566 has 4 divisors (see below), whose sum is σ = 24924785352. Its totient is φ = 8308261782.

The previous prime is 16616523527. The next prime is 16616523593. The reversal of 16616523566 is 66532561661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 66532561661 = 653 ⋅101887537.

It is a super-2 number, since 2×16616523566² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 16616523566.

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 as a sum of consecutive naturals, namely, 4154130890 + ... + 4154130893.

It is an arithmetic number, because the mean of its divisors is an integer number (6231196338).

Almost surely, 2^16616523566 is an apocalyptic number.

16616523566 is a deficient number, since it is larger than the sum of its proper divisors (8308261786).

16616523566 is an equidigital number, since it uses as much as digits as its factorization.

16616523566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8308261785.

The product of its digits is 1166400, while the sum is 47.

The spelling of 16616523566 in words is "sixteen billion, six hundred sixteen million, five hundred twenty-three thousand, five hundred sixty-six".