261676655516413 has 4 divisors (see below), whose sum is σ = 261676950046528. Its totient is φ = 261676360986300.

The previous prime is 261676655516407. The next prime is 261676655516449. The reversal of 261676655516413 is 314615556676162.

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 a de Polignac number, because none of the positive numbers 2^k-261676655516413 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261676655516473) 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, 145928331 + ... + 147710632.

It is an arithmetic number, because the mean of its divisors is an integer number (65419237511632).

Almost surely, 2^{261676655516413} is an apocalyptic number.

It is an amenable number.

261676655516413 is a deficient number, since it is larger than the sum of its proper divisors (294530115).

261676655516413 is an equidigital number, since it uses as much as digits as its factorization.

261676655516413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 294530114.

The product of its digits is 163296000, while the sum is 64.

The spelling of 261676655516413 in words is "two hundred sixty-one trillion, six hundred seventy-six billion, six hundred fifty-five million, five hundred sixteen thousand, four hundred thirteen".