261220389089 has 16 divisors (see below), whose sum is σ = 300231960000. Its totient is φ = 224775025920.

The previous prime is 261220389043. The next prime is 261220389103. The reversal of 261220389089 is 980983022162.

It is a cyclic number.

It is not a de Polignac number, because 261220389089 - 2¹² = 261220384993 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (261220389289) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 317564 + ... + 789485.

It is an arithmetic number, because the mean of its divisors is an integer number (18764497500).

Almost surely, 2^261220389089 is an apocalyptic number.

It is an amenable number.

261220389089 is a deficient number, since it is larger than the sum of its proper divisors (39011570911).

261220389089 is a wasteful number, since it uses less digits than its factorization.

261220389089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1108208.

The product of its (nonzero) digits is 746496, while the sum is 50.

The spelling of 261220389089 in words is "two hundred sixty-one billion, two hundred twenty million, three hundred eighty-nine thousand, eighty-nine".