16459863617 has 4 divisors (see below), whose sum is σ = 16507026900. Its totient is φ = 16412700336.

The previous prime is 16459863577. The next prime is 16459863619. The reversal of 16459863617 is 71636895461.

It is a Cunningham number, because it is equal to 128296²+1.

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 12081527056 + 4378336561 = 109916^2 + 66169^2 .

It is a cyclic number.

It is not a de Polignac number, because 16459863617 - 2³² = 12164896321 is a prime.

It is a super-2 number, since 2×16459863617² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16459863619) 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, 23581118 + ... + 23581815.

It is an arithmetic number, because the mean of its divisors is an integer number (4126756725).

Almost surely, 2^16459863617 is an apocalyptic number.

It is an amenable number.

16459863617 is a deficient number, since it is larger than the sum of its proper divisors (47163283).

16459863617 is an equidigital number, since it uses as much as digits as its factorization.

16459863617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47163282.

The product of its digits is 6531840, while the sum is 56.

The spelling of 16459863617 in words is "sixteen billion, four hundred fifty-nine million, eight hundred sixty-three thousand, six hundred seventeen".