16611006566 has 72 divisors (see below), whose sum is σ = 32073452208. Its totient is φ = 6428268000.

The previous prime is 16611006539. The next prime is 16611006583. The reversal of 16611006566 is 66560011661.

It is a happy number.

It is a super-2 number, since 2×16611006566² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 1785920 + ... + 1795196.

It is an arithmetic number, because the mean of its divisors is an integer number (445464614).

Almost surely, 2^16611006566 is an apocalyptic number.

16611006566 is a deficient number, since it is larger than the sum of its proper divisors (15462445642).

16611006566 is a wasteful number, since it uses less digits than its factorization.

16611006566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9466 (or 9448 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 38.

The spelling of 16611006566 in words is "sixteen billion, six hundred eleven million, six thousand, five hundred sixty-six".