11208811638 has 32 divisors (see below), whose sum is σ = 22906851840. Its totient is φ = 3654817760.

The previous prime is 11208811631. The next prime is 11208811657. The reversal of 11208811638 is 83611880211.

It is a junction number, because it is equal to n+sod(n) for n = 11208811596 and 11208811605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11208811631) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 573853 + ... + 593063.

It is an arithmetic number, because the mean of its divisors is an integer number (715839120).

Almost surely, 2^11208811638 is an apocalyptic number.

11208811638 is an abundant number, since it is smaller than the sum of its proper divisors (11698040202).

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

11208811638 is a wasteful number, since it uses less digits than its factorization.

11208811638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21332.

The product of its (nonzero) digits is 18432, while the sum is 39.

The spelling of 11208811638 in words is "eleven billion, two hundred eight million, eight hundred eleven thousand, six hundred thirty-eight".