16615125666 has 24 divisors (see below), whose sum is σ = 36016671600. Its totient is φ = 5535724056.

The previous prime is 16615125629. The next prime is 16615125679. The reversal of 16615125666 is 66652151661.

It is a Curzon 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 11 ways as a sum of consecutive naturals, for example, 182100 + ... + 257663.

It is an arithmetic number, because the mean of its divisors is an integer number (1500694650).

Almost surely, 2^16615125666 is an apocalyptic number.

16615125666 is an abundant number, since it is smaller than the sum of its proper divisors (19401545934).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

16615125666 is a wasteful number, since it uses less digits than its factorization.

16615125666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 441870 (or 441867 counting only the distinct ones).

The product of its digits is 388800, while the sum is 45.

The spelling of 16615125666 in words is "sixteen billion, six hundred fifteen million, one hundred twenty-five thousand, six hundred sixty-six".