261674360177105 has 4 divisors (see below), whose sum is σ = 314009232212532. Its totient is φ = 209339488141680.

The previous prime is 261674360177081. The next prime is 261674360177137. The reversal of 261674360177105 is 501771063476162.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 139551505228864 + 122122854948241 = 11813192^2 + 11050921^2 .

It is not a de Polignac number, because 261674360177105 - 2⁸ = 261674360176849 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26167436017706 + ... + 26167436017715.

It is an arithmetic number, because the mean of its divisors is an integer number (78502308053133).

Almost surely, 2^{261674360177105} is an apocalyptic number.

It is an amenable number.

261674360177105 is a deficient number, since it is larger than the sum of its proper divisors (52334872035427).

261674360177105 is an equidigital number, since it uses as much as digits as its factorization.

261674360177105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52334872035426.

The product of its (nonzero) digits is 8890560, while the sum is 56.

The spelling of 261674360177105 in words is "two hundred sixty-one trillion, six hundred seventy-four billion, three hundred sixty million, one hundred seventy-seven thousand, one hundred five".