16543559651 has 4 divisors (see below), whose sum is σ = 16553667312. Its totient is φ = 16533451992.

The previous prime is 16543559633. The next prime is 16543559689. The reversal of 16543559651 is 15695534561.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15695534561 = 7 ⋅2242219223.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16543559651 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 16543559651.

It is not an unprimeable number, because it can be changed into a prime (16543519651) 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, 5051375 + ... + 5054648.

It is an arithmetic number, because the mean of its divisors is an integer number (4138416828).

Almost surely, 2^16543559651 is an apocalyptic number.

16543559651 is a deficient number, since it is larger than the sum of its proper divisors (10107661).

16543559651 is a wasteful number, since it uses less digits than its factorization.

16543559651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10107660.

The product of its digits is 2430000, while the sum is 50.

The spelling of 16543559651 in words is "sixteen billion, five hundred forty-three million, five hundred fifty-nine thousand, six hundred fifty-one".