261341513245 has 32 divisors (see below), whose sum is σ = 324857917440. Its totient is φ = 201622763520.

The previous prime is 261341513231. The next prime is 261341513261. The reversal of 261341513245 is 542315143162.

261341513245 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 261341513245 - 2¹⁹ = 261340988957 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 (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 90209637 + ... + 90212533.

It is an arithmetic number, because the mean of its divisors is an integer number (10151809920).

Almost surely, 2^261341513245 is an apocalyptic number.

It is an amenable number.

261341513245 is a deficient number, since it is larger than the sum of its proper divisors (63516404195).

261341513245 is a wasteful number, since it uses less digits than its factorization.

261341513245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4765.

The product of its digits is 86400, while the sum is 37.

The spelling of 261341513245 in words is "two hundred sixty-one billion, three hundred forty-one million, five hundred thirteen thousand, two hundred forty-five".