6687172447722 has 72 divisors (see below), whose sum is σ = 15715867212864. Its totient is φ = 2054085707232.

The previous prime is 6687172447699. The next prime is 6687172447729. The reversal of 6687172447722 is 2277442717866.

6687172447722 is a `hidden beast` number, since 6 + 6 + 8 + 71 + 72 + 4 + 477 + 22 = 666.

It is a hoax number, since the sum of its digits (63) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 6687172447722.

It is not an unprimeable number, because it can be changed into a prime (6687172447729) by changing a digit.

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 35 ways as a sum of consecutive naturals, for example, 86818 + ... + 3658125.

It is an arithmetic number, because the mean of its divisors is an integer number (218275933512).

Almost surely, 2^{6687172447722} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6687172447722, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7857933606432).

6687172447722 is an abundant number, since it is smaller than the sum of its proper divisors (9028694765142).

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

6687172447722 is a wasteful number, since it uses less digits than its factorization.

6687172447722 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3745564 (or 3745548 counting only the distinct ones).

The product of its digits is 88510464, while the sum is 63.

The spelling of 6687172447722 in words is "six trillion, six hundred eighty-seven billion, one hundred seventy-two million, four hundred forty-seven thousand, seven hundred twenty-two".