2172170009725 has 12 divisors (see below), whose sum is σ = 2696098289236. Its totient is φ = 1736053764480.

The previous prime is 2172170009717. The next prime is 2172170009749. The reversal of 2172170009725 is 5279000712712.

It can be written as a sum of positive squares in 6 ways, for example, as 124835929 + 2172045173796 = 11173^2 + 1473786^2 .

It is not a de Polignac number, because 2172170009725 - 2³ = 2172170009717 is a prime.

It is a super-2 number, since 2×2172170009725² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 42029742 + ... + 42081391.

Almost surely, 2^{2172170009725} is an apocalyptic number.

2172170009725 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

2172170009725 is a deficient number, since it is larger than the sum of its proper divisors (523928279511).

2172170009725 is a wasteful number, since it uses less digits than its factorization.

2172170009725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84112176 (or 84112171 counting only the distinct ones).

The product of its (nonzero) digits is 123480, while the sum is 43.

The spelling of 2172170009725 in words is "two trillion, one hundred seventy-two billion, one hundred seventy million, nine thousand, seven hundred twenty-five".