172873618326 has 24 divisors (see below), whose sum is σ = 374929298640. Its totient is φ = 57567648336.

The previous prime is 172873618303. The next prime is 172873618343. The reversal of 172873618326 is 623816378271.

It is a happy number.

172873618326 is a `hidden beast` number, since 1 + 7 + 287 + 36 + 1 + 8 + 326 = 666.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4722186 + ... + 4758653.

It is an arithmetic number, because the mean of its divisors is an integer number (15622054110).

Almost surely, 2^172873618326 is an apocalyptic number.

172873618326 is an abundant number, since it is smaller than the sum of its proper divisors (202055680314).

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

172873618326 is a wasteful number, since it uses less digits than its factorization.

172873618326 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9481860 (or 9481857 counting only the distinct ones).

The product of its digits is 4064256, while the sum is 54.

The spelling of 172873618326 in words is "one hundred seventy-two billion, eight hundred seventy-three million, six hundred eighteen thousand, three hundred twenty-six".