11537638557 has 32 divisors (see below), whose sum is σ = 17007501312. Its totient is φ = 6920120064.

The previous prime is 11537638531. The next prime is 11537638573. The reversal of 11537638557 is 75583673511.

It is a happy number.

It is not a de Polignac number, because 11537638557 - 2¹⁰ = 11537637533 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11537638597) 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 31 ways as a sum of consecutive naturals, for example, 3384748 + ... + 3388154.

It is an arithmetic number, because the mean of its divisors is an integer number (531484416).

Almost surely, 2^11537638557 is an apocalyptic number.

11537638557 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

11537638557 is a deficient number, since it is larger than the sum of its proper divisors (5469862755).

11537638557 is a wasteful number, since it uses less digits than its factorization.

11537638557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6337.

The product of its digits is 2646000, while the sum is 51.

The spelling of 11537638557 in words is "eleven billion, five hundred thirty-seven million, six hundred thirty-eight thousand, five hundred fifty-seven".