16857621078 has 8 divisors (see below), whose sum is σ = 33715242168. Its totient is φ = 5619207024.

The previous prime is 16857621059. The next prime is 16857621101. The reversal of 16857621078 is 87012675861.

It is a happy number.

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

16857621078 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 16857621078.

It is a congruent number.

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, 1404801751 + ... + 1404801762.

It is an arithmetic number, because the mean of its divisors is an integer number (4214405271).

Almost surely, 2^16857621078 is an apocalyptic number.

16857621078 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

16857621078 is a wasteful number, since it uses less digits than its factorization.

16857621078 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2809603518.

The product of its (nonzero) digits is 1128960, while the sum is 51.

The spelling of 16857621078 in words is "sixteen billion, eight hundred fifty-seven million, six hundred twenty-one thousand, seventy-eight".