11556699840 has 896 divisors, whose sum is σ = 50035968000. Its totient is φ = 2452488192.

The previous prime is 11556699827. The next prime is 11556699881. The reversal of 11556699840 is 4899665511.

11556699840 is a `hidden beast` number, since 1 + 1 + 556 + 6 + 9 + 9 + 84 + 0 = 666.

It is a super-2 number, since 2×11556699840² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 102271624 + ... + 102271736.

Almost surely, 2^11556699840 is an apocalyptic number.

11556699840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 11556699840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25017984000).

11556699840 is an abundant number, since it is smaller than the sum of its proper divisors (38479268160).

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

11556699840 is a wasteful number, since it uses less digits than its factorization.

11556699840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 254 (or 238 counting only the distinct ones).

The product of its (nonzero) digits is 2332800, while the sum is 54.

The spelling of 11556699840 in words is "eleven billion, five hundred fifty-six million, six hundred ninety-nine thousand, eight hundred forty".