173138817420 has 72 divisors (see below), whose sum is σ = 535096978416. Its totient is φ = 45299210112.

The previous prime is 173138817329. The next prime is 173138817437. The reversal of 173138817420 is 24718831371.

173138817420 is a `hidden beast` number, since 17 + 3 + 138 + 81 + 7 + 420 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 9064822 + ... + 9083901.

It is an arithmetic number, because the mean of its divisors is an integer number (7431902478).

Almost surely, 2^173138817420 is an apocalyptic number.

173138817420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

173138817420 is an abundant number, since it is smaller than the sum of its proper divisors (361958160996).

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

173138817420 is a wasteful number, since it uses less digits than its factorization.

173138817420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18148791 (or 18148786 counting only the distinct ones).

The product of its (nonzero) digits is 225792, while the sum is 45.

The spelling of 173138817420 in words is "one hundred seventy-three billion, one hundred thirty-eight million, eight hundred seventeen thousand, four hundred twenty".