261543207106023 has 16 divisors (see below), whose sum is σ = 354267696625920. Its totient is φ = 171606403104704.

The previous prime is 261543207105997. The next prime is 261543207106043. The reversal of 261543207106023 is 320601702345162.

It is a cyclic number.

It is not a de Polignac number, because 261543207106023 - 2¹³ = 261543207097831 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261543207106043) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1996843878 + ... + 1996974851.

It is an arithmetic number, because the mean of its divisors is an integer number (22141731039120).

Almost surely, 2^{261543207106023} is an apocalyptic number.

261543207106023 is a deficient number, since it is larger than the sum of its proper divisors (92724489519897).

261543207106023 is a wasteful number, since it uses less digits than its factorization.

261543207106023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3993819078.

The product of its (nonzero) digits is 362880, while the sum is 42.

The spelling of 261543207106023 in words is "two hundred sixty-one trillion, five hundred forty-three billion, two hundred seven million, one hundred six thousand, twenty-three".