11351809638 has 96 divisors (see below), whose sum is σ = 27547936416. Its totient is φ = 3482777088.

The previous prime is 11351809631. The next prime is 11351809661. The reversal of 11351809638 is 83690815311.

It is a happy number.

11351809638 is a `hidden beast` number, since 1 + 1 + 3 + 5 + 1 + 8 + 0 + 9 + 638 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 11351809593 and 11351809602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11351809631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2354206 + ... + 2359022.

It is an arithmetic number, because the mean of its divisors is an integer number (286957671).

Almost surely, 2^11351809638 is an apocalyptic number.

11351809638 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 11351809638, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13773968208).

11351809638 is an abundant number, since it is smaller than the sum of its proper divisors (16196126778).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

11351809638 is a wasteful number, since it uses less digits than its factorization.

11351809638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5220 (or 5208 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 45.

The spelling of 11351809638 in words is "eleven billion, three hundred fifty-one million, eight hundred nine thousand, six hundred thirty-eight".