16680694442 has 8 divisors (see below), whose sum is σ = 25080475332. Its totient is φ = 8320536000.

The previous prime is 16680694397. The next prime is 16680694483. The reversal of 16680694442 is 24449608661.

It can be written as a sum of positive squares in 2 ways, for example, as 12814466401 + 3866228041 = 113201^2 + 62179^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9904559 + ... + 9906242.

Almost surely, 2^16680694442 is an apocalyptic number.

16680694442 is a deficient number, since it is larger than the sum of its proper divisors (8399780890).

16680694442 is a wasteful number, since it uses less digits than its factorization.

16680694442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19811224.

The product of its (nonzero) digits is 1990656, while the sum is 50.

The spelling of 16680694442 in words is "sixteen billion, six hundred eighty million, six hundred ninety-four thousand, four hundred forty-two".