261116622 has 96 divisors (see below), whose sum is σ = 649495392. Its totient is φ = 78102144.

The previous prime is 261116593. The next prime is 261116633. The reversal of 261116622 is 226611162.

261116622 is a `hidden beast` number, since 26 + 1 + 1 + 16 + 622 = 666.

261116622 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 233208 + ... + 234324.

It is an arithmetic number, because the mean of its divisors is an integer number (6765577).

Almost surely, 2^261116622 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 261116622, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (324747696).

261116622 is an abundant number, since it is smaller than the sum of its proper divisors (388378770).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

261116622 is a wasteful number, since it uses less digits than its factorization.

261116622 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1184 (or 1172 counting only the distinct ones).

The product of its digits is 1728, while the sum is 27.

The square root of 261116622 is about 16159.1033785913. The cubic root of 261116622 is about 639.1628230187.

Adding to 261116622 its reverse (226611162), we get a palindrome (487727784).

The spelling of 261116622 in words is "two hundred sixty-one million, one hundred sixteen thousand, six hundred twenty-two".