195566421 has 8 divisors (see below), whose sum is σ = 260820000. Its totient is φ = 130345232.

The previous prime is 195566417. The next prime is 195566429. The reversal of 195566421 is 124665591.

195566421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 195566421 - 2² = 195566417 is a prime.

It is a super-3 number, since 3×195566421³ (a number of 26 digits) contains 333 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 195566421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (195566429) 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, 18151 + ... + 26843.

It is an arithmetic number, because the mean of its divisors is an integer number (32602500).

Almost surely, 2^195566421 is an apocalyptic number.

It is an amenable number.

195566421 is a deficient number, since it is larger than the sum of its proper divisors (65253579).

195566421 is an equidigital number, since it uses as much as digits as its factorization.

195566421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16195.

The product of its digits is 64800, while the sum is 39.

The square root of 195566421 is about 13984.5064625106. The cubic root of 195566421 is about 580.4499293199.

The spelling of 195566421 in words is "one hundred ninety-five million, five hundred sixty-six thousand, four hundred twenty-one".