172213020415547 has 4 divisors (see below), whose sum is σ = 172321809438240. Its totient is φ = 172104231392856.

The previous prime is 172213020415529. The next prime is 172213020415571. The reversal of 172213020415547 is 745514020312271.

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 172213020415547 - 2²⁸ = 172212751980091 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 172213020415498 and 172213020415507.

It is not an unprimeable number, because it can be changed into a prime (172213020415577) 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, 54394508972 + ... + 54394512137.

It is an arithmetic number, because the mean of its divisors is an integer number (43080452359560).

Almost surely, 2^{172213020415547} is an apocalyptic number.

172213020415547 is a deficient number, since it is larger than the sum of its proper divisors (108789022693).

172213020415547 is a wasteful number, since it uses less digits than its factorization.

172213020415547 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108789022692.

The product of its (nonzero) digits is 470400, while the sum is 44.

The spelling of 172213020415547 in words is "one hundred seventy-two trillion, two hundred thirteen billion, twenty million, four hundred fifteen thousand, five hundred forty-seven".