16616610660 has 72 divisors (see below), whose sum is σ = 50380807680. Its totient is φ = 4090240128.

The previous prime is 16616610649. The next prime is 16616610677. The reversal of 16616610660 is 6601661661.

It is a happy number.

It is a super-2 number, since 2×16616610660² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 809220 + ... + 829499.

It is an arithmetic number, because the mean of its divisors is an integer number (699733440).

Almost surely, 2^16616610660 is an apocalyptic number.

16616610660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16616610660 is an abundant number, since it is smaller than the sum of its proper divisors (33764197020).

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

16616610660 is a wasteful number, since it uses less digits than its factorization.

16616610660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1638757 (or 1638742 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 39.

The spelling of 16616610660 in words is "sixteen billion, six hundred sixteen million, six hundred ten thousand, six hundred sixty".