172172701555243 has 4 divisors (see below), whose sum is σ = 174531231713608. Its totient is φ = 169814171396880.

The previous prime is 172172701555237. The next prime is 172172701555301. The reversal of 172172701555243 is 342555107271271.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 172172701555243 - 2²¹ = 172172699458091 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (172172701505243) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1179265079073 + ... + 1179265079218.

It is an arithmetic number, because the mean of its divisors is an integer number (43632807928402).

Almost surely, 2^{172172701555243} is an apocalyptic number.

172172701555243 is a deficient number, since it is larger than the sum of its proper divisors (2358530158365).

172172701555243 is an equidigital number, since it uses as much as digits as its factorization.

172172701555243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2358530158364.

The product of its (nonzero) digits is 4116000, while the sum is 52.

The spelling of 172172701555243 in words is "one hundred seventy-two trillion, one hundred seventy-two billion, seven hundred one million, five hundred fifty-five thousand, two hundred forty-three".