261326973603 has 8 divisors (see below), whose sum is σ = 348440291008. Its totient is φ = 174215819304.

The previous prime is 261326973599. The next prime is 261326973631. The reversal of 261326973603 is 306379623162.

261326973603 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 261326973603 - 2² = 261326973599 is a prime.

It is the 511202-nd Hogben number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261326975603) by changing a digit.

It is a nontrivial repunit in base 511201.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 234025 + ... + 759882.

It is an arithmetic number, because the mean of its divisors is an integer number (43555036376).

Almost surely, 2^261326973603 is an apocalyptic number.

261326973603 is a deficient number, since it is larger than the sum of its proper divisors (87113317405).

261326973603 is an equidigital number, since it uses as much as digits as its factorization.

261326973603 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1081553.

The product of its (nonzero) digits is 1469664, while the sum is 48.

The spelling of 261326973603 in words is "two hundred sixty-one billion, three hundred twenty-six million, nine hundred seventy-three thousand, six hundred three".