11805645949 has 2 divisors, whose sum is σ = 11805645950. Its totient is φ = 11805645948.

The previous prime is 11805645947. The next prime is 11805645983. The reversal of 11805645949 is 94954650811.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11803736025 + 1909924 = 108645^2 + 1382^2 .

It is a cyclic number.

It is not a de Polignac number, because 11805645949 - 2¹ = 11805645947 is a prime.

It is a super-2 number, since 2×11805645949² (a number of 21 digits) contains 22 as substring.

Together with 11805645947, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 11805645896 and 11805645905.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11805645941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5902822974 + 5902822975.

It is an arithmetic number, because the mean of its divisors is an integer number (5902822975).

Almost surely, 2^11805645949 is an apocalyptic number.

It is an amenable number.

11805645949 is a deficient number, since it is larger than the sum of its proper divisors (1).

11805645949 is an equidigital number, since it uses as much as digits as its factorization.

11805645949 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1555200, while the sum is 52.

The spelling of 11805645949 in words is "eleven billion, eight hundred five million, six hundred forty-five thousand, nine hundred forty-nine".