11808775553 has 4 divisors (see below), whose sum is σ = 12215974740. Its totient is φ = 11401576368.

The previous prime is 11808775543. The next prime is 11808775609. The reversal of 11808775553 is 35557780811.

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 9726496129 + 2082279424 = 98623^2 + 45632^2 .

It is a cyclic number.

It is not a de Polignac number, because 11808775553 - 2²⁶ = 11741666689 is a prime.

It is a super-2 number, since 2×11808775553² (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 (11808775543) 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, 203599550 + ... + 203599607.

It is an arithmetic number, because the mean of its divisors is an integer number (3053993685).

Almost surely, 2^11808775553 is an apocalyptic number.

It is an amenable number.

11808775553 is a deficient number, since it is larger than the sum of its proper divisors (407199187).

11808775553 is an equidigital number, since it uses as much as digits as its factorization.

11808775553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 407199186.

The product of its (nonzero) digits is 1176000, while the sum is 50.

The spelling of 11808775553 in words is "eleven billion, eight hundred eight million, seven hundred seventy-five thousand, five hundred fifty-three".