261960194441 has 4 divisors (see below), whose sum is σ = 285774757584. Its totient is φ = 238145631300.

The previous prime is 261960194429. The next prime is 261960194453. The reversal of 261960194441 is 144491069162.

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 an interprime number because it is at equal distance from previous prime (261960194429) and next prime (261960194453).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-261960194441 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261960190441) 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, 11907281555 + ... + 11907281576.

It is an arithmetic number, because the mean of its divisors is an integer number (71443689396).

Almost surely, 2^261960194441 is an apocalyptic number.

It is an amenable number.

261960194441 is a deficient number, since it is larger than the sum of its proper divisors (23814563143).

261960194441 is a wasteful number, since it uses less digits than its factorization.

261960194441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23814563142.

The product of its (nonzero) digits is 373248, while the sum is 47.

The spelling of 261960194441 in words is "two hundred sixty-one billion, nine hundred sixty million, one hundred ninety-four thousand, four hundred forty-one".