169387395489 has 81 divisors (see below), whose sum is σ = 270919684971. Its totient is φ = 101936914560.

The previous prime is 169387395421. The next prime is 169387395491. The reversal of 169387395489 is 984593783961.

The square root of 169387395489 is 411567.

It is a perfect power (a square), and thus also a powerful number.

169387395489 is a `hidden beast` number, since 1 + 6 + 9 + 3 + 8 + 73 + 9 + 548 + 9 = 666.

It can be written as a sum of positive squares in 13 ways, for example, as 157265385489 + 12122010000 = 396567^2 + 110100^2 .

It is not a de Polignac number, because 169387395489 - 2⁹ = 169387394977 is a prime.

It is not an unprimeable number, because it can be changed into a prime (169387395409) by changing a digit.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 979117807 + ... + 979117979.

Almost surely, 2^169387395489 is an apocalyptic number.

169387395489 is the 411567-th square number.

169387395489 is the 205784-th centered octagonal number.

It is an amenable number.

169387395489 is a deficient number, since it is larger than the sum of its proper divisors (101532289482).

169387395489 is an equidigital number, since it uses as much as digits as its factorization.

169387395489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 500 (or 250 counting only the distinct ones).

The product of its digits is 352719360, while the sum is 72.

The spelling of 169387395489 in words is "one hundred sixty-nine billion, three hundred eighty-seven million, three hundred ninety-five thousand, four hundred eighty-nine".