172478505874271 has 4 divisors (see below), whose sum is σ = 172625797511544. Its totient is φ = 172331214237000.

The previous prime is 172478505874249. The next prime is 172478505874321.

172478505874271 is nontrivially palindromic in base 10.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-172478505874271 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172478505870271) 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, 73645816880 + ... + 73645819221.

It is an arithmetic number, because the mean of its divisors is an integer number (43156449377886).

Almost surely, 2^{172478505874271} is an apocalyptic number.

172478505874271 is a deficient number, since it is larger than the sum of its proper divisors (147291637273).

172478505874271 is a wasteful number, since it uses less digits than its factorization.

172478505874271 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147291637272.

The product of its (nonzero) digits is 245862400, while the sum is 68.

The spelling of 172478505874271 in words is "one hundred seventy-two trillion, four hundred seventy-eight billion, five hundred five million, eight hundred seventy-four thousand, two hundred seventy-one".