201808218423 has 8 divisors (see below), whose sum is σ = 307517285248. Its totient is φ = 115318981944.

The previous prime is 201808218419. The next prime is 201808218431. The reversal of 201808218423 is 324812808102.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 201808218423 - 2² = 201808218419 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 (201808218323) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4804957561 + ... + 4804957602.

It is an arithmetic number, because the mean of its divisors is an integer number (38439660656).

Almost surely, 2^201808218423 is an apocalyptic number.

201808218423 is a deficient number, since it is larger than the sum of its proper divisors (105709066825).

201808218423 is an equidigital number, since it uses as much as digits as its factorization.

201808218423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9609915173.

The product of its (nonzero) digits is 49152, while the sum is 39.

The spelling of 201808218423 in words is "two hundred one billion, eight hundred eight million, two hundred eighteen thousand, four hundred twenty-three".