172122239560 has 128 divisors (see below), whose sum is σ = 422081280000. Its totient is φ = 62921456640.

The previous prime is 172122239539. The next prime is 172122239561. The reversal of 172122239560 is 65932221271.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is not an unprimeable number, because it can be changed into a prime (172122239561) 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, 32418186 + ... + 32423494.

It is an arithmetic number, because the mean of its divisors is an integer number (3297510000).

Almost surely, 2^172122239560 is an apocalyptic number.

172122239560 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 172122239560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (211040640000).

172122239560 is an abundant number, since it is smaller than the sum of its proper divisors (249959040440).

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

172122239560 is a wasteful number, since it uses less digits than its factorization.

172122239560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6839 (or 6835 counting only the distinct ones).

The product of its (nonzero) digits is 90720, while the sum is 40.

The spelling of 172122239560 in words is "one hundred seventy-two billion, one hundred twenty-two million, two hundred thirty-nine thousand, five hundred sixty".