172220535505 has 16 divisors (see below), whose sum is σ = 208627539840. Its totient is φ = 136468219392.

The previous prime is 172220535503. The next prime is 172220535521. The reversal of 172220535505 is 505535022271.

It is a cyclic number.

It is not a de Polignac number, because 172220535505 - 2¹ = 172220535503 is a prime.

It is not an unprimeable number, because it can be changed into a prime (172220535503) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4220641 + ... + 4261249.

It is an arithmetic number, because the mean of its divisors is an integer number (13039221240).

Almost surely, 2^172220535505 is an apocalyptic number.

It is an amenable number.

172220535505 is a deficient number, since it is larger than the sum of its proper divisors (36407004335).

172220535505 is a wasteful number, since it uses less digits than its factorization.

172220535505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48648.

The product of its (nonzero) digits is 105000, while the sum is 37.

Adding to 172220535505 its reverse (505535022271), we get a palindrome (677755557776).

The spelling of 172220535505 in words is "one hundred seventy-two billion, two hundred twenty million, five hundred thirty-five thousand, five hundred five".