16851870047 has 4 divisors (see below), whose sum is σ = 16876544040. Its totient is φ = 16827196056.

The previous prime is 16851870037. The next prime is 16851870071. The reversal of 16851870047 is 74007815861.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 16851870047 - 2⁸ = 16851869791 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 16851869983 and 16851870010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16851870017) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12335972 + ... + 12337337.

It is an arithmetic number, because the mean of its divisors is an integer number (4219136010).

Almost surely, 2^16851870047 is an apocalyptic number.

16851870047 is a deficient number, since it is larger than the sum of its proper divisors (24673993).

16851870047 is an equidigital number, since it uses as much as digits as its factorization.

16851870047 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24673992.

The product of its (nonzero) digits is 376320, while the sum is 47.

The spelling of 16851870047 in words is "sixteen billion, eight hundred fifty-one million, eight hundred seventy thousand, forty-seven".