11485605881 has 4 divisors (see below), whose sum is σ = 11673894564. Its totient is φ = 11297317200.

The previous prime is 11485605863. The next prime is 11485605893. The reversal of 11485605881 is 18850658411.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18850658411 = 13 ⋅1450050647.

It can be written as a sum of positive squares in 2 ways, for example, as 1982475625 + 9503130256 = 44525^2 + 97484^2 .

It is a cyclic number.

It is not a de Polignac number, because 11485605881 - 2¹⁰ = 11485604857 is a prime.

It is a super-2 number, since 2×11485605881² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (11485605821) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 94144250 + ... + 94144371.

It is an arithmetic number, because the mean of its divisors is an integer number (2918473641).

Almost surely, 2^11485605881 is an apocalyptic number.

It is an amenable number.

11485605881 is a deficient number, since it is larger than the sum of its proper divisors (188288683).

11485605881 is an equidigital number, since it uses as much as digits as its factorization.

11485605881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 188288682.

The product of its (nonzero) digits is 307200, while the sum is 47.

The spelling of 11485605881 in words is "eleven billion, four hundred eighty-five million, six hundred five thousand, eight hundred eighty-one".