195945219651 has 4 divisors (see below), whose sum is σ = 261260292872. Its totient is φ = 130630146432.

The previous prime is 195945219641. The next prime is 195945219653. The reversal of 195945219651 is 156912549591.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 195945219651 - 2¹⁵ = 195945186883 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 195945219591 and 195945219600.

It is not an unprimeable number, because it can be changed into a prime (195945219653) 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, 32657536606 + ... + 32657536611.

It is an arithmetic number, because the mean of its divisors is an integer number (65315073218).

Almost surely, 2^195945219651 is an apocalyptic number.

195945219651 is a deficient number, since it is larger than the sum of its proper divisors (65315073221).

195945219651 is an equidigital number, since it uses as much as digits as its factorization.

195945219651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65315073220.

The product of its digits is 4374000, while the sum is 57.

The spelling of 195945219651 in words is "one hundred ninety-five billion, nine hundred forty-five million, two hundred nineteen thousand, six hundred fifty-one".