11178953809 has 4 divisors (see below), whose sum is σ = 11179165860. Its totient is φ = 11178741760.

The previous prime is 11178953783. The next prime is 11178953831. The reversal of 11178953809 is 90835987111.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 90835987111 = 127 ⋅715243993.

It can be written as a sum of positive squares in 2 ways, for example, as 882387025 + 10296566784 = 29705^2 + 101472^2 .

It is a cyclic number.

It is not a de Polignac number, because 11178953809 - 2¹¹ = 11178951761 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11178956809) 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, 41169 + ... + 155089.

It is an arithmetic number, because the mean of its divisors is an integer number (2794791465).

Almost surely, 2^11178953809 is an apocalyptic number.

It is an amenable number.

11178953809 is a deficient number, since it is larger than the sum of its proper divisors (212051).

11178953809 is an equidigital number, since it uses as much as digits as its factorization.

11178953809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 212050.

The product of its (nonzero) digits is 544320, while the sum is 52.

The spelling of 11178953809 in words is "eleven billion, one hundred seventy-eight million, nine hundred fifty-three thousand, eight hundred nine".