11278818405 has 16 divisors (see below), whose sum is σ = 20051232960. Its totient is φ = 6015369744.

The previous prime is 11278818389. The next prime is 11278818409. The reversal of 11278818405 is 50481887211.

It is not a de Polignac number, because 11278818405 - 2⁴ = 11278818389 is a prime.

It is a super-2 number, since 2×11278818405² (a number of 21 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11278818409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 41773267 + ... + 41773536.

It is an arithmetic number, because the mean of its divisors is an integer number (1253202060).

Almost surely, 2^11278818405 is an apocalyptic number.

11278818405 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

11278818405 is a deficient number, since it is larger than the sum of its proper divisors (8772414555).

11278818405 is an equidigital number, since it uses as much as digits as its factorization.

11278818405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83546817 (or 83546811 counting only the distinct ones).

The product of its (nonzero) digits is 143360, while the sum is 45.

The spelling of 11278818405 in words is "eleven billion, two hundred seventy-eight million, eight hundred eighteen thousand, four hundred five".