172018857185 has 16 divisors (see below), whose sum is σ = 249788727936. Its totient is φ = 111017211648.

The previous prime is 172018857163. The next prime is 172018857191. The reversal of 172018857185 is 581758810271.

It is not a de Polignac number, because 172018857185 - 2⁸ = 172018856929 is a prime.

It is a super-2 number, since 2×172018857185² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 144553067 + ... + 144554256.

It is an arithmetic number, because the mean of its divisors is an integer number (15611795496).

Almost surely, 2^172018857185 is an apocalyptic number.

It is an amenable number.

172018857185 is a deficient number, since it is larger than the sum of its proper divisors (77769870751).

172018857185 is a wasteful number, since it uses less digits than its factorization.

172018857185 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 289107352.

The product of its (nonzero) digits is 1254400, while the sum is 53.

The spelling of 172018857185 in words is "one hundred seventy-two billion, eighteen million, eight hundred fifty-seven thousand, one hundred eighty-five".