16665023987929 has 2 divisors, whose sum is σ = 16665023987930. Its totient is φ = 16665023987928.

The previous prime is 16665023987881. The next prime is 16665023988031. The reversal of 16665023987929 is 92978932056661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12077202701529 + 4587821286400 = 3475227^2 + 2141920^2 .

It is a cyclic number.

It is not a de Polignac number, because 16665023987929 - 2³⁵ = 16630664249561 is a prime.

It is not a weakly prime, because it can be changed into another prime (16665023984929) 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, 8332511993964 + 8332511993965.

It is an arithmetic number, because the mean of its divisors is an integer number (8332511993965).

Almost surely, 2^{16665023987929} is an apocalyptic number.

It is an amenable number.

16665023987929 is a deficient number, since it is larger than the sum of its proper divisors (1).

16665023987929 is an equidigital number, since it uses as much as digits as its factorization.

16665023987929 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 529079040, while the sum is 73.

The spelling of 16665023987929 in words is "sixteen trillion, six hundred sixty-five billion, twenty-three million, nine hundred eighty-seven thousand, nine hundred twenty-nine".