261622663434 has 48 divisors (see below), whose sum is σ = 619193787264. Its totient is φ = 79175371200.

The previous prime is 261622663403. The next prime is 261622663439. The reversal of 261622663434 is 434366226162.

261622663434 is a `hidden beast` number, since 2 + 6 + 1 + 6 + 2 + 2 + 6 + 634 + 3 + 4 = 666.

261622663434 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 261622663434.

It is not an unprimeable number, because it can be changed into a prime (261622663439) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 717474 + ... + 1018829.

It is an arithmetic number, because the mean of its divisors is an integer number (12899870568).

Almost surely, 2^261622663434 is an apocalyptic number.

261622663434 is an abundant number, since it is smaller than the sum of its proper divisors (357571123830).

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

261622663434 is a wasteful number, since it uses less digits than its factorization.

261622663434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1737083 (or 1737080 counting only the distinct ones).

The product of its digits is 1492992, while the sum is 45.

Adding to 261622663434 its reverse (434366226162), we get a palindrome (695988889596).

The spelling of 261622663434 in words is "two hundred sixty-one billion, six hundred twenty-two million, six hundred sixty-three thousand, four hundred thirty-four".