261600542005 has 32 divisors (see below), whose sum is σ = 362506700160. Its totient is φ = 179422414080.

The previous prime is 261600541987. The next prime is 261600542033. The reversal of 261600542005 is 500245006162.

It is not a de Polignac number, because 261600542005 - 2⁷ = 261600541877 is a prime.

It is a congruent number.

It is an unprimeable number.

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, 1838542 + ... + 1975711.

It is an arithmetic number, because the mean of its divisors is an integer number (11328334380).

Almost surely, 2^261600542005 is an apocalyptic number.

It is an amenable number.

261600542005 is a deficient number, since it is larger than the sum of its proper divisors (100906158155).

261600542005 is a wasteful number, since it uses less digits than its factorization.

261600542005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3814341.

The product of its (nonzero) digits is 14400, while the sum is 31.

Adding to 261600542005 its reverse (500245006162), we get a palindrome (761845548167).

The spelling of 261600542005 in words is "two hundred sixty-one billion, six hundred million, five hundred forty-two thousand, five".