261301140161 has 8 divisors (see below), whose sum is σ = 261521307264. Its totient is φ = 261081035280.

The previous prime is 261301140157. The next prime is 261301140187. The reversal of 261301140161 is 161041103162.

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

It is a cyclic number.

It is not a de Polignac number, because 261301140161 - 2² = 261301140157 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 261301140161.

It is not an unprimeable number, because it can be changed into a prime (261301140131) 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, 12204776 + ... + 12226166.

It is an arithmetic number, because the mean of its divisors is an integer number (32690163408).

Almost surely, 2^261301140161 is an apocalyptic number.

It is an amenable number.

261301140161 is a deficient number, since it is larger than the sum of its proper divisors (220167103).

261301140161 is a wasteful number, since it uses less digits than its factorization.

261301140161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31111.

The product of its (nonzero) digits is 864, while the sum is 26.

The spelling of 261301140161 in words is "two hundred sixty-one billion, three hundred one million, one hundred forty thousand, one hundred sixty-one".