16551572069 has 2 divisors, whose sum is σ = 16551572070. Its totient is φ = 16551572068.

The previous prime is 16551571963. The next prime is 16551572077. The reversal of 16551572069 is 96027515561.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12956130625 + 3595441444 = 113825^2 + 59962^2 .

It is a cyclic number.

It is not a de Polignac number, because 16551572069 - 2¹⁶ = 16551506533 is a prime.

It is a super-2 number, since 2×16551572069² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16551572369) 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 as a sum of consecutive naturals, namely, 8275786034 + 8275786035.

It is an arithmetic number, because the mean of its divisors is an integer number (8275786035).

Almost surely, 2^16551572069 is an apocalyptic number.

It is an amenable number.

16551572069 is a deficient number, since it is larger than the sum of its proper divisors (1).

16551572069 is an equidigital number, since it uses as much as digits as its factorization.

16551572069 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 567000, while the sum is 47.

The spelling of 16551572069 in words is "sixteen billion, five hundred fifty-one million, five hundred seventy-two thousand, sixty-nine".