195820576381 has 4 divisors (see below), whose sum is σ = 195821528764. Its totient is φ = 195819624000.

The previous prime is 195820576373. The next prime is 195820576387. The reversal of 195820576381 is 183675028591.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 183675028591 = 839 ⋅218921369.

It can be written as a sum of positive squares in 2 ways, for example, as 97496940025 + 98323636356 = 312245^2 + 313566^2 .

It is a cyclic number.

It is not a de Polignac number, because 195820576381 - 2³ = 195820576373 is a prime.

It is a super-2 number, since 2×195820576381² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (195820576387) 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, 25740 + ... + 626341.

It is an arithmetic number, because the mean of its divisors is an integer number (48955382191).

Almost surely, 2^195820576381 is an apocalyptic number.

It is an amenable number.

195820576381 is a deficient number, since it is larger than the sum of its proper divisors (952383).

195820576381 is an equidigital number, since it uses as much as digits as its factorization.

195820576381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 952382.

The product of its (nonzero) digits is 3628800, while the sum is 55.

The spelling of 195820576381 in words is "one hundred ninety-five billion, eight hundred twenty million, five hundred seventy-six thousand, three hundred eighty-one".