16668219952 has 40 divisors (see below), whose sum is σ = 32606730000. Its totient is φ = 8253910272.

The previous prime is 16668219949. The next prime is 16668219961. The reversal of 16668219952 is 25991286661.

It is a junction number, because it is equal to n+sod(n) for n = 16668219893 and 16668219902.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 817174 + ... + 837322.

It is an arithmetic number, because the mean of its divisors is an integer number (815168250).

Almost surely, 2^16668219952 is an apocalyptic number.

It is an amenable number.

16668219952 is a deficient number, since it is larger than the sum of its proper divisors (15938510048).

16668219952 is a wasteful number, since it uses less digits than its factorization.

16668219952 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20653 (or 20647 counting only the distinct ones).

The product of its digits is 2799360, while the sum is 55.

The spelling of 16668219952 in words is "sixteen billion, six hundred sixty-eight million, two hundred nineteen thousand, nine hundred fifty-two".