261890703361 has 16 divisors (see below), whose sum is σ = 312690090240. Its totient is φ = 214591204800.

The previous prime is 261890703343. The next prime is 261890703367. The reversal of 261890703361 is 163307098162.

It is not a de Polignac number, because 261890703361 - 2¹⁹ = 261890179073 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261890703367) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6366141 + ... + 6407146.

It is an arithmetic number, because the mean of its divisors is an integer number (19543130640).

Almost surely, 2^261890703361 is an apocalyptic number.

It is an amenable number.

261890703361 is a deficient number, since it is larger than the sum of its proper divisors (50799386879).

261890703361 is a wasteful number, since it uses less digits than its factorization.

261890703361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12773424.

The product of its (nonzero) digits is 326592, while the sum is 46.

The spelling of 261890703361 in words is "two hundred sixty-one billion, eight hundred ninety million, seven hundred three thousand, three hundred sixty-one".