261105222011 has 8 divisors (see below), whose sum is σ = 272476472064. Its totient is φ = 249735542760.

The previous prime is 261105221969. The next prime is 261105222013. The reversal of 261105222011 is 110222501162.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-261105222011 is a prime.

It is a super-2 number, since 2×261105222011² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261105222013) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 46511 + ... + 724136.

It is an arithmetic number, because the mean of its divisors is an integer number (34059559008).

Almost surely, 2^261105222011 is an apocalyptic number.

261105222011 is a deficient number, since it is larger than the sum of its proper divisors (11371250053).

261105222011 is a wasteful number, since it uses less digits than its factorization.

261105222011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 785401.

The product of its (nonzero) digits is 480, while the sum is 23.

Adding to 261105222011 its reverse (110222501162), we get a palindrome (371327723173).

The spelling of 261105222011 in words is "two hundred sixty-one billion, one hundred five million, two hundred twenty-two thousand, eleven".