261647574063243 has 16 divisors (see below), whose sum is σ = 369866569430400. Its totient is φ = 164062242573120.

The previous prime is 261647574063241. The next prime is 261647574063269. The reversal of 261647574063243 is 342360475746162.

It is not a de Polignac number, because 261647574063243 - 2¹ = 261647574063241 is a prime.

It is not an unprimeable number, because it can be changed into a prime (261647574063241) 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, 16511892498 + ... + 16511908343.

It is an arithmetic number, because the mean of its divisors is an integer number (23116660589400).

Almost surely, 2^{261647574063243} is an apocalyptic number.

261647574063243 is a deficient number, since it is larger than the sum of its proper divisors (108218995367157).

261647574063243 is a wasteful number, since it uses less digits than its factorization.

261647574063243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33023801002.

The product of its (nonzero) digits is 121927680, while the sum is 60.

The spelling of 261647574063243 in words is "two hundred sixty-one trillion, six hundred forty-seven billion, five hundred seventy-four million, sixty-three thousand, two hundred forty-three".