16541257647 has 4 divisors (see below), whose sum is σ = 22055010200. Its totient is φ = 11027505096.

The previous prime is 16541257639. The next prime is 16541257661. The reversal of 16541257647 is 74675214561.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 74675214561 = 3 ⋅24891738187.

It is not a de Polignac number, because 16541257647 - 2³ = 16541257639 is a prime.

It is a super-2 number, since 2×16541257647² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 16541257596 and 16541257605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16541257627) 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, 2756876272 + ... + 2756876277.

It is an arithmetic number, because the mean of its divisors is an integer number (5513752550).

Almost surely, 2^16541257647 is an apocalyptic number.

16541257647 is a deficient number, since it is larger than the sum of its proper divisors (5513752553).

16541257647 is an equidigital number, since it uses as much as digits as its factorization.

16541257647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5513752552.

The product of its digits is 1411200, while the sum is 48.

The spelling of 16541257647 in words is "sixteen billion, five hundred forty-one million, two hundred fifty-seven thousand, six hundred forty-seven".