195439920523 has 4 divisors (see below), whose sum is σ = 195440804800. Its totient is φ = 195439036248.

The previous prime is 195439920509. The next prime is 195439920539. The reversal of 195439920523 is 325029934591.

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: 325029934591 = 29 ⋅11207928779.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-195439920523 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (195439920553) 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, 210886 + ... + 659812.

It is an arithmetic number, because the mean of its divisors is an integer number (48860201200).

Almost surely, 2^195439920523 is an apocalyptic number.

195439920523 is a deficient number, since it is larger than the sum of its proper divisors (884277).

195439920523 is an equidigital number, since it uses as much as digits as its factorization.

195439920523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 884276.

The product of its (nonzero) digits is 2624400, while the sum is 52.

The spelling of 195439920523 in words is "one hundred ninety-five billion, four hundred thirty-nine million, nine hundred twenty thousand, five hundred twenty-three".