16851192917 has 4 divisors (see below), whose sum is σ = 18147438540. Its totient is φ = 15554947296.

The previous prime is 16851192899. The next prime is 16851192937. The reversal of 16851192917 is 71929115861.

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

It can be written as a sum of positive squares in 2 ways, for example, as 6672602596 + 10178590321 = 81686^2 + 100889^2 .

It is a cyclic number.

It is not a de Polignac number, because 16851192917 - 2¹⁰ = 16851191893 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16851192937) 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, 648122792 + ... + 648122817.

It is an arithmetic number, because the mean of its divisors is an integer number (4536859635).

Almost surely, 2^16851192917 is an apocalyptic number.

It is an amenable number.

16851192917 is a deficient number, since it is larger than the sum of its proper divisors (1296245623).

16851192917 is a wasteful number, since it uses less digits than its factorization.

16851192917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1296245622.

The product of its digits is 272160, while the sum is 50.

The spelling of 16851192917 in words is "sixteen billion, eight hundred fifty-one million, one hundred ninety-two thousand, nine hundred seventeen".