201623953543 has 4 divisors (see below), whose sum is σ = 202280709400. Its totient is φ = 200967197688.

The previous prime is 201623953477. The next prime is 201623953547. The reversal of 201623953543 is 345359326102.

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 201623953543 - 2³³ = 193034018951 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 201623953543.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201623953547) 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, 328377468 + ... + 328378081.

It is an arithmetic number, because the mean of its divisors is an integer number (50570177350).

Almost surely, 2^201623953543 is an apocalyptic number.

201623953543 is a deficient number, since it is larger than the sum of its proper divisors (656755857).

201623953543 is an equidigital number, since it uses as much as digits as its factorization.

201623953543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 656755856.

The product of its (nonzero) digits is 583200, while the sum is 43.

The spelling of 201623953543 in words is "two hundred one billion, six hundred twenty-three million, nine hundred fifty-three thousand, five hundred forty-three".