261646343242253 has 16 divisors (see below), whose sum is σ = 271103506061760. Its totient is φ = 252356670948096.

The previous prime is 261646343242237. The next prime is 261646343242259. The reversal of 261646343242253 is 352242343646162.

261646343242253 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 261646343242253 - 2⁴ = 261646343242237 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (53).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 261646343242195 and 261646343242204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261646343242259) 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, 566966501 + ... + 567427797.

It is an arithmetic number, because the mean of its divisors is an integer number (16943969128860).

Almost surely, 2^{261646343242253} is an apocalyptic number.

It is an amenable number.

261646343242253 is a deficient number, since it is larger than the sum of its proper divisors (9457162819507).

261646343242253 is a wasteful number, since it uses less digits than its factorization.

261646343242253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 642796.

The product of its digits is 29859840, while the sum is 53.

The spelling of 261646343242253 in words is "two hundred sixty-one trillion, six hundred forty-six billion, three hundred forty-three million, two hundred forty-two thousand, two hundred fifty-three".