16659661650 has 48 divisors (see below), whose sum is σ = 41324137824. Its totient is φ = 4441697280.

The previous prime is 16659661637. The next prime is 16659661661. The reversal of 16659661650 is 5616695661.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 16659661593 and 16659661602.

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, 1173897 + ... + 1188003.

It is an arithmetic number, because the mean of its divisors is an integer number (860919538).

Almost surely, 2^16659661650 is an apocalyptic number.

16659661650 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

16659661650 is an abundant number, since it is smaller than the sum of its proper divisors (24664476174).

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

16659661650 is a wasteful number, since it uses less digits than its factorization.

16659661650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21995 (or 21990 counting only the distinct ones).

The product of its (nonzero) digits is 1749600, while the sum is 51.

The spelling of 16659661650 in words is "sixteen billion, six hundred fifty-nine million, six hundred sixty-one thousand, six hundred fifty".