16665655549 has 2 divisors, whose sum is σ = 16665655550. Its totient is φ = 16665655548.

The previous prime is 16665655507. The next prime is 16665655619. The reversal of 16665655549 is 94555656661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16105386649 + 560268900 = 126907^2 + 23670^2 .

It is a cyclic number.

It is not a de Polignac number, because 16665655549 - 2³³ = 8075720957 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 16665655493 and 16665655502.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16665650549) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8332827774 + 8332827775.

It is an arithmetic number, because the mean of its divisors is an integer number (8332827775).

Almost surely, 2^16665655549 is an apocalyptic number.

It is an amenable number.

16665655549 is a deficient number, since it is larger than the sum of its proper divisors (1).

16665655549 is an equidigital number, since it uses as much as digits as its factorization.

16665655549 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 29160000, while the sum is 58.

The spelling of 16665655549 in words is "sixteen billion, six hundred sixty-five million, six hundred fifty-five thousand, five hundred forty-nine".