162561739209 has 32 divisors (see below), whose sum is σ = 233520376320. Its totient is φ = 100258155648.

The previous prime is 162561739189. The next prime is 162561739211. The reversal of 162561739209 is 902937165261.

It is not a de Polignac number, because 162561739209 - 2⁹ = 162561738697 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (162561739259) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 18213822 + ... + 18222744.

It is an arithmetic number, because the mean of its divisors is an integer number (7297511760).

Almost surely, 2^162561739209 is an apocalyptic number.

162561739209 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

162561739209 is a deficient number, since it is larger than the sum of its proper divisors (70958637111).

162561739209 is a wasteful number, since it uses less digits than its factorization.

162561739209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16421.

The product of its (nonzero) digits is 1224720, while the sum is 51.

The spelling of 162561739209 in words is "one hundred sixty-two billion, five hundred sixty-one million, seven hundred thirty-nine thousand, two hundred nine".