16442660647 has 24 divisors (see below), whose sum is σ = 20044773216. Its totient is φ = 13422866688.

The previous prime is 16442660603. The next prime is 16442660659. The reversal of 16442660647 is 74606624461.

It is not a de Polignac number, because 16442660647 - 2¹⁵ = 16442627879 is a prime.

It is a super-3 number, since 3×16442660647³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 16442660597 and 16442660606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16442660687) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 231283 + ... + 293899.

It is an arithmetic number, because the mean of its divisors is an integer number (835198884).

Almost surely, 2^16442660647 is an apocalyptic number.

16442660647 is a deficient number, since it is larger than the sum of its proper divisors (3602112569).

16442660647 is a wasteful number, since it uses less digits than its factorization.

16442660647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62887 (or 62880 counting only the distinct ones).

The product of its (nonzero) digits is 1161216, while the sum is 46.

The spelling of 16442660647 in words is "sixteen billion, four hundred forty-two million, six hundred sixty thousand, six hundred forty-seven".