195278081361 has 12 divisors (see below), whose sum is σ = 286192670736. Its totient is φ = 118350352120.

The previous prime is 195278081333. The next prime is 195278081363. The reversal of 195278081361 is 163180872591.

It is not a de Polignac number, because 195278081361 - 2⁵ = 195278081329 is a prime.

It is a super-2 number, since 2×195278081361² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (195278081363) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 268977711 + ... + 268978436.

It is an arithmetic number, because the mean of its divisors is an integer number (23849389228).

Almost surely, 2^195278081361 is an apocalyptic number.

195278081361 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

195278081361 is a deficient number, since it is larger than the sum of its proper divisors (90914589375).

195278081361 is a wasteful number, since it uses less digits than its factorization.

195278081361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 537956172 (or 537956161 counting only the distinct ones).

The product of its (nonzero) digits is 725760, while the sum is 51.

The spelling of 195278081361 in words is "one hundred ninety-five billion, two hundred seventy-eight million, eighty-one thousand, three hundred sixty-one".