261026226189 has 32 divisors (see below), whose sum is σ = 407110246400. Its totient is φ = 164837689200.

The previous prime is 261026226163. The next prime is 261026226203. The reversal of 261026226189 is 981622620162.

261026226189 is a `hidden beast` number, since 2 + 6 + 1 + 0 + 2 + 6 + 22 + 618 + 9 = 666.

It is not a de Polignac number, because 261026226189 - 2⁵ = 261026226157 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261026226089) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4666662 + ... + 4722264.

It is an arithmetic number, because the mean of its divisors is an integer number (12722195200).

Almost surely, 2^261026226189 is an apocalyptic number.

It is an amenable number.

261026226189 is a deficient number, since it is larger than the sum of its proper divisors (146084020211).

261026226189 is a wasteful number, since it uses less digits than its factorization.

261026226189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64782 (or 64776 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 45.

The spelling of 261026226189 in words is "two hundred sixty-one billion, twenty-six million, two hundred twenty-six thousand, one hundred eighty-nine".