261314618811 has 4 divisors (see below), whose sum is σ = 348419491752. Its totient is φ = 174209745872.

The previous prime is 261314618743. The next prime is 261314618861. The reversal of 261314618811 is 118816413162.

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 261314618811 - 2⁷ = 261314618683 is a prime.

It is not an unprimeable number, because it can be changed into a prime (261314618861) 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, 43552436466 + ... + 43552436471.

It is an arithmetic number, because the mean of its divisors is an integer number (87104872938).

Almost surely, 2^261314618811 is an apocalyptic number.

261314618811 is a deficient number, since it is larger than the sum of its proper divisors (87104872941).

261314618811 is an equidigital number, since it uses as much as digits as its factorization.

261314618811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87104872940.

The product of its digits is 55296, while the sum is 42.

The spelling of 261314618811 in words is "two hundred sixty-one billion, three hundred fourteen million, six hundred eighteen thousand, eight hundred eleven".