11503135638 has 12 divisors (see below), whose sum is σ = 24923460588. Its totient is φ = 3834378540.

The previous prime is 11503135543. The next prime is 11503135639. The reversal of 11503135638 is 83653130511.

11503135638 is a `hidden beast` number, since 1 + 1 + 5 + 0 + 3 + 13 + 5 + 638 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11503135639) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 319531528 + ... + 319531563.

It is an arithmetic number, because the mean of its divisors is an integer number (2076955049).

Almost surely, 2^11503135638 is an apocalyptic number.

11503135638 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

11503135638 is an abundant number, since it is smaller than the sum of its proper divisors (13420324950).

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

11503135638 is a wasteful number, since it uses less digits than its factorization.

11503135638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 639063099 (or 639063096 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 36.

The spelling of 11503135638 in words is "eleven billion, five hundred three million, one hundred thirty-five thousand, six hundred thirty-eight".