195811799039 has 4 divisors (see below), whose sum is σ = 195822493560. Its totient is φ = 195801104520.

The previous prime is 195811799011. The next prime is 195811799089. The reversal of 195811799039 is 930997118591.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 930997118591 = 51383 ⋅18118777.

It is a cyclic number.

It is not a de Polignac number, because 195811799039 - 2⁸ = 195811798783 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (195811799089) 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, 5319749 + ... + 5356430.

It is an arithmetic number, because the mean of its divisors is an integer number (48955623390).

Almost surely, 2^195811799039 is an apocalyptic number.

195811799039 is a deficient number, since it is larger than the sum of its proper divisors (10694521).

195811799039 is a wasteful number, since it uses less digits than its factorization.

195811799039 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10694520.

The product of its (nonzero) digits is 5511240, while the sum is 62.

The spelling of 195811799039 in words is "one hundred ninety-five billion, eight hundred eleven million, seven hundred ninety-nine thousand, thirty-nine".