261674360177161 has 4 divisors (see below), whose sum is σ = 261674406686592. Its totient is φ = 261674313667732.

The previous prime is 261674360177137. The next prime is 261674360177201. The reversal of 261674360177161 is 161771063476162.

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 261674360177161 - 2¹¹ = 261674360175113 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 261674360177096 and 261674360177105.

It is not an unprimeable number, because it can be changed into a prime (261674360175161) 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, 13432405 + ... + 26528818.

It is an arithmetic number, because the mean of its divisors is an integer number (65418601671648).

Almost surely, 2^{261674360177161} is an apocalyptic number.

It is an amenable number.

261674360177161 is a deficient number, since it is larger than the sum of its proper divisors (46509431).

261674360177161 is an equidigital number, since it uses as much as digits as its factorization.

261674360177161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46509430.

The product of its (nonzero) digits is 10668672, while the sum is 58.

The spelling of 261674360177161 in words is "two hundred sixty-one trillion, six hundred seventy-four billion, three hundred sixty million, one hundred seventy-seven thousand, one hundred sixty-one".