261451013612765 has 8 divisors (see below), whose sum is σ = 313741645463808. Its totient is φ = 209160524804560.

The previous prime is 261451013612731. The next prime is 261451013612783. The reversal of 261451013612765 is 567216310154162.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 261451013612765 - 2¹⁰ = 261451013611741 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 31697621 + ... + 39085050.

It is an arithmetic number, because the mean of its divisors is an integer number (39217705682976).

Almost surely, 2^{261451013612765} is an apocalyptic number.

It is an amenable number.

261451013612765 is a deficient number, since it is larger than the sum of its proper divisors (52290631851043).

261451013612765 is an equidigital number, since it uses as much as digits as its factorization.

261451013612765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71521419.

The product of its (nonzero) digits is 1814400, while the sum is 50.

The spelling of 261451013612765 in words is "two hundred sixty-one trillion, four hundred fifty-one billion, thirteen million, six hundred twelve thousand, seven hundred sixty-five".