261345152226 has 16 divisors (see below), whose sum is σ = 523503205344. Its totient is φ = 86979567264.

The previous prime is 261345152221. The next prime is 261345152239. The reversal of 261345152226 is 622251543162.

261345152226 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×261345152226² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (261345152221) 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 7 ways as a sum of consecutive naturals, for example, 33866691 + ... + 33874406.

It is an arithmetic number, because the mean of its divisors is an integer number (32718950334).

Almost surely, 2^261345152226 is an apocalyptic number.

261345152226 is an abundant number, since it is smaller than the sum of its proper divisors (262158053118).

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

261345152226 is a wasteful number, since it uses less digits than its factorization.

261345152226 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67741745.

The product of its digits is 172800, while the sum is 39.

Adding to 261345152226 its reverse (622251543162), we get a palindrome (883596695388).

The spelling of 261345152226 in words is "two hundred sixty-one billion, three hundred forty-five million, one hundred fifty-two thousand, two hundred twenty-six".