261011011101 has 4 divisors (see below), whose sum is σ = 348014681472. Its totient is φ = 174007340732.

The previous prime is 261011011069. The next prime is 261011011123. The reversal of 261011011101 is 101110110162.

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 261011011101 - 2⁵ = 261011011069 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261011011171) 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, 43501835181 + ... + 43501835186.

It is an arithmetic number, because the mean of its divisors is an integer number (87003670368).

Almost surely, 2^261011011101 is an apocalyptic number.

It is an amenable number.

261011011101 is a deficient number, since it is larger than the sum of its proper divisors (87003670371).

261011011101 is an equidigital number, since it uses as much as digits as its factorization.

261011011101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87003670370.

The product of its (nonzero) digits is 12, while the sum is 15.

Adding to 261011011101 its reverse (101110110162), we get a palindrome (362121121263).

The spelling of 261011011101 in words is "two hundred sixty-one billion, eleven million, eleven thousand, one hundred one".