195421009057 has 4 divisors (see below), whose sum is σ = 195432667056. Its totient is φ = 195409351060.

The previous prime is 195421009033. The next prime is 195421009067. The reversal of 195421009057 is 750900124591.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 195421009057 - 2¹¹ = 195421007009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (195421009067) 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, 5803819 + ... + 5837392.

It is an arithmetic number, because the mean of its divisors is an integer number (48858166764).

Almost surely, 2^195421009057 is an apocalyptic number.

It is an amenable number.

195421009057 is a deficient number, since it is larger than the sum of its proper divisors (11657999).

195421009057 is a wasteful number, since it uses less digits than its factorization.

195421009057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11657998.

The product of its (nonzero) digits is 113400, while the sum is 43.

The spelling of 195421009057 in words is "one hundred ninety-five billion, four hundred twenty-one million, nine thousand, fifty-seven".