10818421778 has 8 divisors (see below), whose sum is σ = 16236302268. Its totient is φ = 5406321024.

The previous prime is 10818421777. The next prime is 10818421879. The reversal of 10818421778 is 87712481801.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 8646582169 + 2171839609 = 92987^2 + 46603^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (10818421777) 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, 1440251 + ... + 1447742.

Almost surely, 2^10818421778 is an apocalyptic number.

10818421778 is a deficient number, since it is larger than the sum of its proper divisors (5417880490).

10818421778 is a wasteful number, since it uses less digits than its factorization.

10818421778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2889868.

The product of its (nonzero) digits is 200704, while the sum is 47.

The spelling of 10818421778 in words is "ten billion, eight hundred eighteen million, four hundred twenty-one thousand, seven hundred seventy-eight".