172855218885 has 32 divisors (see below), whose sum is σ = 277276970880. Its totient is φ = 91953416448.

The previous prime is 172855218863. The next prime is 172855218929. The reversal of 172855218885 is 588812558271.

It is not a de Polignac number, because 172855218885 - 2²¹ = 172853121733 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 25978219 + ... + 25984871.

It is an arithmetic number, because the mean of its divisors is an integer number (8664905340).

Almost surely, 2^172855218885 is an apocalyptic number.

172855218885 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

172855218885 is a deficient number, since it is larger than the sum of its proper divisors (104421751995).

172855218885 is a wasteful number, since it uses less digits than its factorization.

172855218885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10837.

The product of its digits is 14336000, while the sum is 60.

The spelling of 172855218885 in words is "one hundred seventy-two billion, eight hundred fifty-five million, two hundred eighteen thousand, eight hundred eighty-five".