16856172912 has 20 divisors (see below), whose sum is σ = 43545113480. Its totient is φ = 5618724288.

The previous prime is 16856172869. The next prime is 16856172941. The reversal of 16856172912 is 21927165861.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (48), and also a Moran number because the ratio is a prime number: 351170269 = 16856172912 / (1 + 6 + 8 + 5 + 6 + 1 + 7 + 2 + 9 + 1 + 2).

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, 175585087 + ... + 175585182.

It is an arithmetic number, because the mean of its divisors is an integer number (2177255674).

Almost surely, 2^16856172912 is an apocalyptic number.

16856172912 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

16856172912 is an abundant number, since it is smaller than the sum of its proper divisors (26688940568).

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

16856172912 is a wasteful number, since it uses less digits than its factorization.

16856172912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 351170280 (or 351170274 counting only the distinct ones).

The product of its digits is 362880, while the sum is 48.

The spelling of 16856172912 in words is "sixteen billion, eight hundred fifty-six million, one hundred seventy-two thousand, nine hundred twelve".