261586126854199 has 4 divisors (see below), whose sum is σ = 298955573547664. Its totient is φ = 224216680160736.

The previous prime is 261586126854131. The next prime is 261586126854251. The reversal of 261586126854199 is 991458621685162.

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

It is a cyclic number.

It is not a de Polignac number, because 261586126854199 - 2¹⁷ = 261586126723127 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261586126954199) 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, 18684723346722 + ... + 18684723346735.

It is an arithmetic number, because the mean of its divisors is an integer number (74738893386916).

Almost surely, 2^{261586126854199} is an apocalyptic number.

261586126854199 is a deficient number, since it is larger than the sum of its proper divisors (37369446693465).

261586126854199 is an equidigital number, since it uses as much as digits as its factorization.

261586126854199 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37369446693464.

The product of its digits is 447897600, while the sum is 73.

The spelling of 261586126854199 in words is "two hundred sixty-one trillion, five hundred eighty-six billion, one hundred twenty-six million, eight hundred fifty-four thousand, one hundred ninety-nine".