195972820081 has 4 divisors (see below), whose sum is σ = 197804341872. Its totient is φ = 194141298292.

The previous prime is 195972820061. The next prime is 195972820091. The reversal of 195972820081 is 180028279591.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 195972820081 - 2²³ = 195964431473 is a prime.

It is a super-2 number, since 2×195972820081² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (195972820061) 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, 915760735 + ... + 915760948.

It is an arithmetic number, because the mean of its divisors is an integer number (49451085468).

Almost surely, 2^195972820081 is an apocalyptic number.

It is an amenable number.

195972820081 is a deficient number, since it is larger than the sum of its proper divisors (1831521791).

195972820081 is a wasteful number, since it uses less digits than its factorization.

195972820081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1831521790.

The product of its (nonzero) digits is 725760, while the sum is 52.

The spelling of 195972820081 in words is "one hundred ninety-five billion, nine hundred seventy-two million, eight hundred twenty thousand, eighty-one".