172171403237720 has 32 divisors (see below), whose sum is σ = 387592042993200. Its totient is φ = 68831870502528.

The previous prime is 172171403237711. The next prime is 172171403237731. The reversal of 172171403237720 is 27732304171271.

It is a super-3 number, since 3×172171403237720³ (a number of 44 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1146511250 + ... + 1146661409.

Almost surely, 2^{172171403237720} is an apocalyptic number.

172171403237720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

172171403237720 is an abundant number, since it is smaller than the sum of its proper divisors (215420639755480).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

172171403237720 is a wasteful number, since it uses less digits than its factorization.

172171403237720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2293174547 (or 2293174543 counting only the distinct ones).

The product of its (nonzero) digits is 691488, while the sum is 47.

The spelling of 172171403237720 in words is "one hundred seventy-two trillion, one hundred seventy-one billion, four hundred three million, two hundred thirty-seven thousand, seven hundred twenty".