172245677868 has 144 divisors (see below), whose sum is σ = 496185371136. Its totient is φ = 49870529280.

The previous prime is 172245677861. The next prime is 172245677881. The reversal of 172245677868 is 868776542271.

It is a happy number.

172245677868 is a `hidden beast` number, since 1 + 7 + 2 + 2 + 4 + 567 + 7 + 8 + 68 = 666.

It is not an unprimeable number, because it can be changed into a prime (172245677861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 8524105 + ... + 8544287.

It is an arithmetic number, because the mean of its divisors is an integer number (3445731744).

Almost surely, 2^172245677868 is an apocalyptic number.

172245677868 is a gapful number since it is divisible by the number (18) 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 172245677868, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (248092685568).

172245677868 is an abundant number, since it is smaller than the sum of its proper divisors (323939693268).

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

172245677868 is a wasteful number, since it uses less digits than its factorization.

172245677868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21164 (or 21159 counting only the distinct ones).

The product of its digits is 63221760, while the sum is 63.

The spelling of 172245677868 in words is "one hundred seventy-two billion, two hundred forty-five million, six hundred seventy-seven thousand, eight hundred sixty-eight".