11405485261 has 4 divisors (see below), whose sum is σ = 11406297532. Its totient is φ = 11404672992.

The previous prime is 11405485219. The next prime is 11405485277. The reversal of 11405485261 is 16258450411.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5222808361 + 6182676900 = 72269^2 + 78630^2 .

It is a cyclic number.

It is not a de Polignac number, because 11405485261 - 2¹⁵ = 11405452493 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 11405485261.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11405482261) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 384696 + ... + 413281.

It is an arithmetic number, because the mean of its divisors is an integer number (2851574383).

Almost surely, 2^11405485261 is an apocalyptic number.

It is an amenable number.

11405485261 is a deficient number, since it is larger than the sum of its proper divisors (812271).

11405485261 is an equidigital number, since it uses as much as digits as its factorization.

11405485261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 812270.

The product of its (nonzero) digits is 38400, while the sum is 37.

The spelling of 11405485261 in words is "eleven billion, four hundred five million, four hundred eighty-five thousand, two hundred sixty-one".