261473028851 has 16 divisors (see below), whose sum is σ = 283184584704. Its totient is φ = 240481202304.

The previous prime is 261473028847. The next prime is 261473028871. The reversal of 261473028851 is 158820374162.

261473028851 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 261473028851 - 2² = 261473028847 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (47).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 261473028796 and 261473028805.

It is not an unprimeable number, because it can be changed into a prime (261473028871) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 259286 + ... + 768228.

It is an arithmetic number, because the mean of its divisors is an integer number (17699036544).

Almost surely, 2^261473028851 is an apocalyptic number.

261473028851 is a deficient number, since it is larger than the sum of its proper divisors (21711555853).

261473028851 is a wasteful number, since it uses less digits than its factorization.

261473028851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 509650.

The product of its (nonzero) digits is 645120, while the sum is 47.

The spelling of 261473028851 in words is "two hundred sixty-one billion, four hundred seventy-three million, twenty-eight thousand, eight hundred fifty-one".