261543700315011 has 4 divisors (see below), whose sum is σ = 348724933753352. Its totient is φ = 174362466876672.

The previous prime is 261543700314991. The next prime is 261543700315043. The reversal of 261543700315011 is 110513007345162.

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

It is not a de Polignac number, because 261543700315011 - 2⁵ = 261543700314979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261543700315411) 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, 43590616719166 + ... + 43590616719171.

It is an arithmetic number, because the mean of its divisors is an integer number (87181233438338).

Almost surely, 2^{261543700315011} is an apocalyptic number.

261543700315011 is a deficient number, since it is larger than the sum of its proper divisors (87181233438341).

261543700315011 is an equidigital number, since it uses as much as digits as its factorization.

261543700315011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87181233438340.

The product of its (nonzero) digits is 75600, while the sum is 39.

The spelling of 261543700315011 in words is "two hundred sixty-one trillion, five hundred forty-three billion, seven hundred million, three hundred fifteen thousand, eleven".