261453555285 has 32 divisors (see below), whose sum is σ = 462680400000. Its totient is φ = 125236793088.

The previous prime is 261453555241. The next prime is 261453555287. The reversal of 261453555285 is 582555354162.

It is not a de Polignac number, because 261453555285 - 2¹¹ = 261453553237 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261453555287) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 18111535 + ... + 18125964.

It is an arithmetic number, because the mean of its divisors is an integer number (14458762500).

Almost surely, 2^261453555285 is an apocalyptic number.

It is an amenable number.

261453555285 is a deficient number, since it is larger than the sum of its proper divisors (201226844715).

261453555285 is a wasteful number, since it uses less digits than its factorization.

261453555285 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36237557.

The product of its digits is 7200000, while the sum is 51.

The spelling of 261453555285 in words is "two hundred sixty-one billion, four hundred fifty-three million, five hundred fifty-five thousand, two hundred eighty-five".