261394727903 has 24 divisors (see below), whose sum is σ = 276623468160. Its totient is φ = 246917734560.

The previous prime is 261394727879. The next prime is 261394727963. The reversal of 261394727903 is 309727493162.

It is a de Polignac number, because none of the positive numbers 2^k-261394727903 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 (261394727963) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10457126 + ... + 10482092.

It is an arithmetic number, because the mean of its divisors is an integer number (11525977840).

Almost surely, 2^261394727903 is an apocalyptic number.

261394727903 is a deficient number, since it is larger than the sum of its proper divisors (15228740257).

261394727903 is a wasteful number, since it uses less digits than its factorization.

261394727903 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25295 (or 25266 counting only the distinct ones).

The product of its (nonzero) digits is 3429216, while the sum is 53.

The spelling of 261394727903 in words is "two hundred sixty-one billion, three hundred ninety-four million, seven hundred twenty-seven thousand, nine hundred three".