172172216870 has 16 divisors (see below), whose sum is σ = 312172109568. Its totient is φ = 68366193600.

The previous prime is 172172216861. The next prime is 172172216917. The reversal of 172172216870 is 78612271271.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 62835206 + ... + 62837945.

It is an arithmetic number, because the mean of its divisors is an integer number (19510756848).

Almost surely, 2^172172216870 is an apocalyptic number.

172172216870 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

172172216870 is a deficient number, since it is larger than the sum of its proper divisors (139999892698).

172172216870 is a wasteful number, since it uses less digits than its factorization.

172172216870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125673295.

The product of its (nonzero) digits is 131712, while the sum is 44.

The spelling of 172172216870 in words is "one hundred seventy-two billion, one hundred seventy-two million, two hundred sixteen thousand, eight hundred seventy".