261121121160 has 64 divisors (see below), whose sum is σ = 784998950400. Its totient is φ = 69486913536.

The previous prime is 261121121077. The next prime is 261121121207. The reversal of 261121121160 is 61121121162.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 261121121160.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2213929 + ... + 2328888.

It is an arithmetic number, because the mean of its divisors is an integer number (12265608600).

Almost surely, 2^261121121160 is an apocalyptic number.

261121121160 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

261121121160 is an abundant number, since it is smaller than the sum of its proper divisors (523877829240).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

261121121160 is a wasteful number, since it uses less digits than its factorization.

261121121160 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4543310 (or 4543306 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 24.

The spelling of 261121121160 in words is "two hundred sixty-one billion, one hundred twenty-one million, one hundred twenty-one thousand, one hundred sixty".