261646061312253 has 4 divisors (see below), whose sum is σ = 348861415083008. Its totient is φ = 174430707541500.

The previous prime is 261646061312227. The next prime is 261646061312269. The reversal of 261646061312253 is 352213160646162.

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 not a de Polignac number, because 261646061312253 - 2³⁶ = 261577341835517 is a prime.

It is a super-2 number, since 2×261646061312253² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261646061312953) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43607676885373 + ... + 43607676885378.

It is an arithmetic number, because the mean of its divisors is an integer number (87215353770752).

Almost surely, 2^{261646061312253} is an apocalyptic number.

It is an amenable number.

261646061312253 is a deficient number, since it is larger than the sum of its proper divisors (87215353770755).

261646061312253 is an equidigital number, since it uses as much as digits as its factorization.

261646061312253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87215353770754.

The product of its (nonzero) digits is 1866240, while the sum is 48.

The spelling of 261646061312253 in words is "two hundred sixty-one trillion, six hundred forty-six billion, sixty-one million, three hundred twelve thousand, two hundred fifty-three".