261045853289 has 32 divisors (see below), whose sum is σ = 289311337728. Its totient is φ = 234057600000.

The previous prime is 261045853283. The next prime is 261045853291. The reversal of 261045853289 is 982358540162.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 261045853289 - 2⁴ = 261045853273 is a prime.

It is a super-2 number, since 2×261045853289² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 261045853289.

It is not an unprimeable number, because it can be changed into a prime (261045853283) 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, 86984789 + ... + 86987789.

It is an arithmetic number, because the mean of its divisors is an integer number (9040979304).

Almost surely, 2^261045853289 is an apocalyptic number.

It is an amenable number.

261045853289 is a deficient number, since it is larger than the sum of its proper divisors (28265484439).

261045853289 is a wasteful number, since it uses less digits than its factorization.

261045853289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4449.

The product of its (nonzero) digits is 4147200, while the sum is 53.

The spelling of 261045853289 in words is "two hundred sixty-one billion, forty-five million, eight hundred fifty-three thousand, two hundred eighty-nine".