261544534241342 has 16 divisors (see below), whose sum is σ = 446589876650112. Its totient is φ = 113715014887320.

The previous prime is 261544534241323. The next prime is 261544534241357. The reversal of 261544534241342 is 243142435445162.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 258443215148 + ... + 258443216159.

It is an arithmetic number, because the mean of its divisors is an integer number (27911867290632).

Almost surely, 2^{261544534241342} is an apocalyptic number.

261544534241342 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

261544534241342 is a deficient number, since it is larger than the sum of its proper divisors (185045342408770).

261544534241342 is a wasteful number, since it uses less digits than its factorization.

261544534241342 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 516886431343.

The product of its digits is 11059200, while the sum is 50.

The spelling of 261544534241342 in words is "two hundred sixty-one trillion, five hundred forty-four billion, five hundred thirty-four million, two hundred forty-one thousand, three hundred forty-two".