172320381642 has 16 divisors (see below), whose sum is σ = 347986791360. Its totient is φ = 56882455872.

The previous prime is 172320381637. The next prime is 172320381643. The reversal of 172320381642 is 246183023271.

It is a self number, because there is not a number n which added to its sum of digits gives 172320381642.

It is not an unprimeable number, because it can be changed into a prime (172320381643) 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 7 ways as a sum of consecutive naturals, for example, 139417167 + ... + 139418402.

It is an arithmetic number, because the mean of its divisors is an integer number (21749174460).

Almost surely, 2^172320381642 is an apocalyptic number.

172320381642 is an abundant number, since it is smaller than the sum of its proper divisors (175666409718).

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

172320381642 is a wasteful number, since it uses less digits than its factorization.

172320381642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 278835677.

The product of its (nonzero) digits is 96768, while the sum is 39.

The spelling of 172320381642 in words is "one hundred seventy-two billion, three hundred twenty million, three hundred eighty-one thousand, six hundred forty-two".