261717305223 has 16 divisors (see below), whose sum is σ = 380708487936. Its totient is φ = 158604560640.

The previous prime is 261717305173. The next prime is 261717305261. The reversal of 261717305223 is 322503717162.

It is not a de Polignac number, because 261717305223 - 2¹³ = 261717297031 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261717305273) 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, 153790 + ... + 739652.

It is an arithmetic number, because the mean of its divisors is an integer number (23794280496).

Almost surely, 2^261717305223 is an apocalyptic number.

261717305223 is a deficient number, since it is larger than the sum of its proper divisors (118991182713).

261717305223 is a wasteful number, since it uses less digits than its factorization.

261717305223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 599414.

The product of its (nonzero) digits is 105840, while the sum is 39.

The spelling of 261717305223 in words is "two hundred sixty-one billion, seven hundred seventeen million, three hundred five thousand, two hundred twenty-three".