172472447646 has 12 divisors (see below), whose sum is σ = 373690303272. Its totient is φ = 57490815876.

The previous prime is 172472447639. The next prime is 172472447647. The reversal of 172472447646 is 646744274271.

172472447646 is a `hidden beast` number, since 1 + 72 + 4 + 72 + 447 + 64 + 6 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 172472447592 and 172472447601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172472447647) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4790901306 + ... + 4790901341.

It is an arithmetic number, because the mean of its divisors is an integer number (31140858606).

Almost surely, 2^172472447646 is an apocalyptic number.

172472447646 is an abundant number, since it is smaller than the sum of its proper divisors (201217855626).

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

172472447646 is a wasteful number, since it uses less digits than its factorization.

172472447646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9581802655 (or 9581802652 counting only the distinct ones).

The product of its digits is 12644352, while the sum is 54.

The spelling of 172472447646 in words is "one hundred seventy-two billion, four hundred seventy-two million, four hundred forty-seven thousand, six hundred forty-six".