16556051565 has 64 divisors (see below), whose sum is σ = 31702809600. Its totient is φ = 8170569792.

The previous prime is 16556051531. The next prime is 16556051569. The reversal of 16556051565 is 56515065561.

16556051565 is a `hidden beast` number, since 16 + 5 + 5 + 60 + 515 + 65 = 666.

It is not a de Polignac number, because 16556051565 - 2¹⁸ = 16555789421 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 16556051565.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16556051569) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 35242 + ... + 185348.

It is an arithmetic number, because the mean of its divisors is an integer number (495356400).

Almost surely, 2^16556051565 is an apocalyptic number.

16556051565 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

16556051565 is a deficient number, since it is larger than the sum of its proper divisors (15146758035).

16556051565 is a wasteful number, since it uses less digits than its factorization.

16556051565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 150183 (or 150177 counting only the distinct ones).

The product of its (nonzero) digits is 675000, while the sum is 45.

The spelling of 16556051565 in words is "sixteen billion, five hundred fifty-six million, fifty-one thousand, five hundred sixty-five".