16606777069 has 2 divisors, whose sum is σ = 16606777070. Its totient is φ = 16606777068.

The previous prime is 16606777049. The next prime is 16606777091. The reversal of 16606777069 is 96077760661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15567552900 + 1039224169 = 124770^2 + 32237^2 .

It is a cyclic number.

It is not a de Polignac number, because 16606777069 - 2⁵ = 16606777037 is a prime.

It is a super-2 number, since 2×16606777069² (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 (16606777049) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8303388534 + 8303388535.

It is an arithmetic number, because the mean of its divisors is an integer number (8303388535).

Almost surely, 2^16606777069 is an apocalyptic number.

It is an amenable number.

16606777069 is a deficient number, since it is larger than the sum of its proper divisors (1).

16606777069 is an equidigital number, since it uses as much as digits as its factorization.

16606777069 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4000752, while the sum is 55.

The spelling of 16606777069 in words is "sixteen billion, six hundred six million, seven hundred seventy-seven thousand, sixty-nine".