195343994561 has 4 divisors (see below), whose sum is σ = 196835170224. Its totient is φ = 193852818900.

The previous prime is 195343994539. The next prime is 195343994567. The reversal of 195343994561 is 165499343591.

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 195343994561 - 2⁶ = 195343994497 is a prime.

It is a super-3 number, since 3×195343994561³ (a number of 35 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

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 195343994561.

It is not an unprimeable number, because it can be changed into a prime (195343994567) 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, 745587635 + ... + 745587896.

It is an arithmetic number, because the mean of its divisors is an integer number (49208792556).

Almost surely, 2^195343994561 is an apocalyptic number.

It is an amenable number.

195343994561 is a deficient number, since it is larger than the sum of its proper divisors (1491175663).

195343994561 is a wasteful number, since it uses less digits than its factorization.

195343994561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1491175662.

The product of its digits is 15746400, while the sum is 59.

The spelling of 195343994561 in words is "one hundred ninety-five billion, three hundred forty-three million, nine hundred ninety-four thousand, five hundred sixty-one".