195087815825979 has 4 divisors (see below), whose sum is σ = 260117087767976. Its totient is φ = 130058543883984.

The previous prime is 195087815825977. The next prime is 195087815826053. The reversal of 195087815825979 is 979528518780591.

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

It is not a de Polignac number, because 195087815825979 - 2¹ = 195087815825977 is a prime.

It is a super-2 number, since 2×195087815825979² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (195087815825977) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32514635970994 + ... + 32514635970999.

It is an arithmetic number, because the mean of its divisors is an integer number (65029271941994).

Almost surely, 2^{195087815825979} is an apocalyptic number.

195087815825979 is a deficient number, since it is larger than the sum of its proper divisors (65029271941997).

195087815825979 is an equidigital number, since it uses as much as digits as its factorization.

195087815825979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65029271941996.

The product of its (nonzero) digits is 4572288000, while the sum is 84.

The spelling of 195087815825979 in words is "one hundred ninety-five trillion, eighty-seven billion, eight hundred fifteen million, eight hundred twenty-five thousand, nine hundred seventy-nine".