16665329749 has 2 divisors, whose sum is σ = 16665329750. Its totient is φ = 16665329748.

The previous prime is 16665329743. The next prime is 16665329771. The reversal of 16665329749 is 94792356661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11377422225 + 5287907524 = 106665^2 + 72718^2 .

It is a cyclic number.

It is not a de Polignac number, because 16665329749 - 2³ = 16665329741 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 16665329693 and 16665329702.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16665329741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8332664874 + 8332664875.

It is an arithmetic number, because the mean of its divisors is an integer number (8332664875).

Almost surely, 2^16665329749 is an apocalyptic number.

It is an amenable number.

16665329749 is a deficient number, since it is larger than the sum of its proper divisors (1).

16665329749 is an equidigital number, since it uses as much as digits as its factorization.

16665329749 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 14696640, while the sum is 58.

The spelling of 16665329749 in words is "sixteen billion, six hundred sixty-five million, three hundred twenty-nine thousand, seven hundred forty-nine".