172125891784 has 32 divisors (see below), whose sum is σ = 402372216000. Its totient is φ = 67062035520.

The previous prime is 172125891779. The next prime is 172125891793. The reversal of 172125891784 is 487198521271.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 139711959 + ... + 139713190.

It is an arithmetic number, because the mean of its divisors is an integer number (12574131750).

Almost surely, 2^172125891784 is an apocalyptic number.

172125891784 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

172125891784 is an abundant number, since it is smaller than the sum of its proper divisors (230246324216).

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

172125891784 is a wasteful number, since it uses less digits than its factorization.

172125891784 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 279425173 (or 279425169 counting only the distinct ones).

The product of its digits is 2257920, while the sum is 55.

The spelling of 172125891784 in words is "one hundred seventy-two billion, one hundred twenty-five million, eight hundred ninety-one thousand, seven hundred eighty-four".