16616610666 has 24 divisors (see below), whose sum is σ = 36005095620. Its totient is φ = 5538494976.

The previous prime is 16616610649. The next prime is 16616610677. The reversal of 16616610666 is 66601661661.

It can be written as a sum of positive squares in 2 ways, for example, as 13925180025 + 2691430641 = 118005^2 + 51879^2 .

It is a super-2 number, since 2×16616610666² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 410380 + ... + 449048.

Almost surely, 2^16616610666 is an apocalyptic number.

16616610666 is an abundant number, since it is smaller than the sum of its proper divisors (19388484954).

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

16616610666 is a wasteful number, since it uses less digits than its factorization.

16616610666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62550 (or 62547 counting only the distinct ones).

The product of its (nonzero) digits is 279936, while the sum is 45.

The spelling of 16616610666 in words is "sixteen billion, six hundred sixteen million, six hundred ten thousand, six hundred sixty-six".