16516643512 has 16 divisors (see below), whose sum is σ = 31967697600. Its totient is φ = 7991924160.

The previous prime is 16516643503. The next prime is 16516643537. The reversal of 16516643512 is 21534661561.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33299437 + ... + 33299932.

It is an arithmetic number, because the mean of its divisors is an integer number (1997981100).

Almost surely, 2^16516643512 is an apocalyptic number.

It is an amenable number.

16516643512 is a deficient number, since it is larger than the sum of its proper divisors (15451054088).

16516643512 is a wasteful number, since it uses less digits than its factorization.

16516643512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66599406 (or 66599402 counting only the distinct ones).

The product of its digits is 129600, while the sum is 40.

The spelling of 16516643512 in words is "sixteen billion, five hundred sixteen million, six hundred forty-three thousand, five hundred twelve".