195943896781 has 8 divisors (see below), whose sum is σ = 198142552440. Its totient is φ = 193748886528.

The previous prime is 195943896767. The next prime is 195943896829. The reversal of 195943896781 is 187698349591.

It can be written as a sum of positive squares in 4 ways, for example, as 3565164681 + 192378732100 = 59709^2 + 438610^2 .

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 195943896781 - 2¹⁷ = 195943765709 is a prime.

It is a super-2 number, since 2×195943896781² (a number of 23 digits) contains 22 as substring.

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 195943896781.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (195943896881) 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, 803176 + ... + 1018321.

It is an arithmetic number, because the mean of its divisors is an integer number (24767819055).

Almost surely, 2^195943896781 is an apocalyptic number.

It is an amenable number.

195943896781 is a deficient number, since it is larger than the sum of its proper divisors (2198655659).

195943896781 is a wasteful number, since it uses less digits than its factorization.

195943896781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1822703.

The product of its digits is 117573120, while the sum is 70.

The spelling of 195943896781 in words is "one hundred ninety-five billion, nine hundred forty-three million, eight hundred ninety-six thousand, seven hundred eighty-one".