11557634840 has 32 divisors (see below), whose sum is σ = 26039934000. Its totient is φ = 4616786304.

The previous prime is 11557634827. The next prime is 11557634867. The reversal of 11557634840 is 4843675511.

It is a junction number, because it is equal to n+sod(n) for n = 11557634791 and 11557634800.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 165935 + ... + 225054.

Almost surely, 2^11557634840 is an apocalyptic number.

11557634840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11557634840 is an abundant number, since it is smaller than the sum of its proper divisors (14482299160).

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

11557634840 is a wasteful number, since it uses less digits than its factorization.

11557634840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 391739 (or 391735 counting only the distinct ones).

The product of its (nonzero) digits is 403200, while the sum is 44.

The spelling of 11557634840 in words is "eleven billion, five hundred fifty-seven million, six hundred thirty-four thousand, eight hundred forty".