16209857869 has 2 divisors, whose sum is σ = 16209857870. Its totient is φ = 16209857868.

The previous prime is 16209857843. The next prime is 16209857899. The reversal of 16209857869 is 96875890261.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16068604644 + 141253225 = 126762^2 + 11885^2 .

It is a cyclic number.

It is not a de Polignac number, because 16209857869 - 2²⁹ = 15672986957 is a prime.

It is a super-2 number, since 2×16209857869² (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 (16209857819) 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, 8104928934 + 8104928935.

It is an arithmetic number, because the mean of its divisors is an integer number (8104928935).

Almost surely, 2^16209857869 is an apocalyptic number.

It is an amenable number.

16209857869 is a deficient number, since it is larger than the sum of its proper divisors (1).

16209857869 is an equidigital number, since it uses as much as digits as its factorization.

16209857869 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13063680, while the sum is 61.

The spelling of 16209857869 in words is "sixteen billion, two hundred nine million, eight hundred fifty-seven thousand, eight hundred sixty-nine".