261128487226 has 16 divisors (see below), whose sum is σ = 405714313440. Its totient is φ = 125901825840.

The previous prime is 261128487223. The next prime is 261128487239. The reversal of 261128487226 is 622784821162.

It is a self number, because there is not a number n which added to its sum of digits gives 261128487226.

It is not an unprimeable number, because it can be changed into a prime (261128487223) 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, 2814720 + ... + 2906011.

It is an arithmetic number, because the mean of its divisors is an integer number (25357144590).

Almost surely, 2^261128487226 is an apocalyptic number.

261128487226 is a deficient number, since it is larger than the sum of its proper divisors (144585826214).

261128487226 is a wasteful number, since it uses less digits than its factorization.

261128487226 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5721549.

The product of its digits is 1032192, while the sum is 49.

The spelling of 261128487226 in words is "two hundred sixty-one billion, one hundred twenty-eight million, four hundred eighty-seven thousand, two hundred twenty-six".