261005761103 has 16 divisors (see below), whose sum is σ = 269617988640. Its totient is φ = 252510701184.

The previous prime is 261005761091. The next prime is 261005761147. The reversal of 261005761103 is 301167500162.

It is not a de Polignac number, because 261005761103 - 2¹⁰ = 261005760079 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 261005761103.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261005761193) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16926425 + ... + 16941837.

It is an arithmetic number, because the mean of its divisors is an integer number (16851124290).

Almost surely, 2^261005761103 is an apocalyptic number.

261005761103 is a deficient number, since it is larger than the sum of its proper divisors (8612227537).

261005761103 is a wasteful number, since it uses less digits than its factorization.

261005761103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19178.

The product of its (nonzero) digits is 7560, while the sum is 32.

The spelling of 261005761103 in words is "two hundred sixty-one billion, five million, seven hundred sixty-one thousand, one hundred three".