195420308981 has 8 divisors (see below), whose sum is σ = 208425956760. Its totient is φ = 182582476288.

The previous prime is 195420308953. The next prime is 195420309023. The reversal of 195420308981 is 189803024591.

It can be written as a sum of positive squares in 4 ways, for example, as 31240562500 + 164179746481 = 176750^2 + 405191^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-195420308981 is a prime.

It is a super-2 number, since 2×195420308981² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (195420308081) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41951366 + ... + 41956023.

It is an arithmetic number, because the mean of its divisors is an integer number (26053244595).

Almost surely, 2^195420308981 is an apocalyptic number.

It is an amenable number.

195420308981 is a deficient number, since it is larger than the sum of its proper divisors (13005647779).

195420308981 is a wasteful number, since it uses less digits than its factorization.

195420308981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83907543.

The product of its (nonzero) digits is 622080, while the sum is 50.

The spelling of 195420308981 in words is "one hundred ninety-five billion, four hundred twenty million, three hundred eight thousand, nine hundred eighty-one".