261564252541023 has 16 divisors (see below), whose sum is σ = 348954283034496. Its totient is φ = 174275220551520.

The previous prime is 261564252541003. The next prime is 261564252541043. The reversal of 261564252541023 is 320145252465162.

It is an interprime number because it is at equal distance from previous prime (261564252541003) and next prime (261564252541043).

It is not a de Polignac number, because 261564252541023 - 2¹⁰ = 261564252539999 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261564252541003) 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, 38164261 + ... + 44493137.

It is an arithmetic number, because the mean of its divisors is an integer number (21809642689656).

Almost surely, 2^{261564252541023} is an apocalyptic number.

261564252541023 is a deficient number, since it is larger than the sum of its proper divisors (87390030493473).

261564252541023 is a wasteful number, since it uses less digits than its factorization.

261564252541023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6336854.

The product of its (nonzero) digits is 3456000, while the sum is 48.

The spelling of 261564252541023 in words is "two hundred sixty-one trillion, five hundred sixty-four billion, two hundred fifty-two million, five hundred forty-one thousand, twenty-three".