16601507189 has 2 divisors, whose sum is σ = 16601507190. Its totient is φ = 16601507188.

The previous prime is 16601507173. The next prime is 16601507191. The reversal of 16601507189 is 98170510661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8792250289 + 7809256900 = 93767^2 + 88370^2 .

It is an emirp because it is prime and its reverse (98170510661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16601507189 - 2⁴ = 16601507173 is a prime.

It is a super-2 number, since 2×16601507189² (a number of 21 digits) contains 22 as substring.

Together with 16601507191, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16601507789) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8300753594 + 8300753595.

It is an arithmetic number, because the mean of its divisors is an integer number (8300753595).

Almost surely, 2^16601507189 is an apocalyptic number.

It is an amenable number.

16601507189 is a deficient number, since it is larger than the sum of its proper divisors (1).

16601507189 is an equidigital number, since it uses as much as digits as its factorization.

16601507189 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 90720, while the sum is 44.

The spelling of 16601507189 in words is "sixteen billion, six hundred one million, five hundred seven thousand, one hundred eighty-nine".