172426873656 has 128 divisors (see below), whose sum is σ = 455323680000. Its totient is φ = 54332544000.

The previous prime is 172426873649. The next prime is 172426873657. The reversal of 172426873656 is 656378624271.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 172426873596 and 172426873605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172426873657) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10298700 + ... + 10315428.

It is an arithmetic number, because the mean of its divisors is an integer number (3557216250).

Almost surely, 2^172426873656 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 172426873656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (227661840000).

172426873656 is an abundant number, since it is smaller than the sum of its proper divisors (282896806344).

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

172426873656 is a wasteful number, since it uses less digits than its factorization.

172426873656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17077 (or 17073 counting only the distinct ones).

The product of its digits is 20321280, while the sum is 57.

The spelling of 172426873656 in words is "one hundred seventy-two billion, four hundred twenty-six million, eight hundred seventy-three thousand, six hundred fifty-six".