16205530563551 has 4 divisors (see below), whose sum is σ = 18520606358352. Its totient is φ = 13890454768752.

The previous prime is 16205530563539. The next prime is 16205530563553. The reversal of 16205530563551 is 15536503550261.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16205530563551 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 16205530563496 and 16205530563505.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16205530563553) 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, 1157537897390 + ... + 1157537897403.

It is an arithmetic number, because the mean of its divisors is an integer number (4630151589588).

Almost surely, 2^{16205530563551} is an apocalyptic number.

16205530563551 is a deficient number, since it is larger than the sum of its proper divisors (2315075794801).

16205530563551 is an equidigital number, since it uses as much as digits as its factorization.

16205530563551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2315075794800.

The product of its (nonzero) digits is 2025000, while the sum is 47.

The spelling of 16205530563551 in words is "sixteen trillion, two hundred five billion, five hundred thirty million, five hundred sixty-three thousand, five hundred fifty-one".