172974742871 has 4 divisors (see below), whose sum is σ = 197685420432. Its totient is φ = 148264065312.

The previous prime is 172974742867. The next prime is 172974742873. The reversal of 172974742871 is 178247479271.

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 172974742871 - 2² = 172974742867 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 172974742871.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172974742873) 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 3 ways as a sum of consecutive naturals, for example, 12355338770 + ... + 12355338783.

It is an arithmetic number, because the mean of its divisors is an integer number (49421355108).

Almost surely, 2^172974742871 is an apocalyptic number.

172974742871 is a deficient number, since it is larger than the sum of its proper divisors (24710677561).

172974742871 is an equidigital number, since it uses as much as digits as its factorization.

172974742871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24710677560.

The product of its digits is 11063808, while the sum is 59.

The spelling of 172974742871 in words is "one hundred seventy-two billion, nine hundred seventy-four million, seven hundred forty-two thousand, eight hundred seventy-one".