261552403011453 has 4 divisors (see below), whose sum is σ = 348736537348608. Its totient is φ = 174368268674300.

The previous prime is 261552403011413. The next prime is 261552403011461. The reversal of 261552403011453 is 354110304255162.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 261552403011453 - 2³⁷ = 261414964057981 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261552403011413) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43592067168573 + ... + 43592067168578.

It is an arithmetic number, because the mean of its divisors is an integer number (87184134337152).

Almost surely, 2^{261552403011453} is an apocalyptic number.

It is an amenable number.

261552403011453 is a deficient number, since it is larger than the sum of its proper divisors (87184134337155).

261552403011453 is an equidigital number, since it uses as much as digits as its factorization.

261552403011453 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87184134337154.

The product of its (nonzero) digits is 432000, while the sum is 42.

The spelling of 261552403011453 in words is "two hundred sixty-one trillion, five hundred fifty-two billion, four hundred three million, eleven thousand, four hundred fifty-three".