261030261909 has 8 divisors (see below), whose sum is σ = 348531241120. Its totient is φ = 173774728656.

The previous prime is 261030261871. The next prime is 261030261917. The reversal of 261030261909 is 909162030162.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 261030261909 - 2⁷ = 261030261781 is a prime.

It is a super-2 number, since 2×261030261909² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261030261509) 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, 61359007 + ... + 61363260.

It is an arithmetic number, because the mean of its divisors is an integer number (43566405140).

Almost surely, 2^261030261909 is an apocalyptic number.

It is an amenable number.

261030261909 is a deficient number, since it is larger than the sum of its proper divisors (87500979211).

261030261909 is a wasteful number, since it uses less digits than its factorization.

261030261909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122722979.

The product of its (nonzero) digits is 34992, while the sum is 39.

The spelling of 261030261909 in words is "two hundred sixty-one billion, thirty million, two hundred sixty-one thousand, nine hundred nine".