261742727247163 has 16 divisors (see below), whose sum is σ = 279384867468000. Its totient is φ = 244353284255232.

The previous prime is 261742727247137. The next prime is 261742727247229. The reversal of 261742727247163 is 361742727247162.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-261742727247163 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261742727242163) 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, 47319528 + ... + 52560661.

It is an arithmetic number, because the mean of its divisors is an integer number (17461554216750).

Almost surely, 2^{261742727247163} is an apocalyptic number.

261742727247163 is a deficient number, since it is larger than the sum of its proper divisors (17642140220837).

261742727247163 is a wasteful number, since it uses less digits than its factorization.

261742727247163 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99881454.

The product of its digits is 66382848, while the sum is 61.

Subtracting 261742727247163 from its reverse (361742727247162), we obtain a palindrome (99999999999999).

The spelling of 261742727247163 in words is "two hundred sixty-one trillion, seven hundred forty-two billion, seven hundred twenty-seven million, two hundred forty-seven thousand, one hundred sixty-three".