11911800640 has 56 divisors (see below), whose sum is σ = 28764536832. Its totient is φ = 4697602560.

The previous prime is 11911800629. The next prime is 11911800653. The reversal of 11911800640 is 4600811911.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 239424 + ... + 284863.

Almost surely, 2^11911800640 is an apocalyptic number.

11911800640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11911800640 is an abundant number, since it is smaller than the sum of its proper divisors (16852736192).

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

11911800640 is an equidigital number, since it uses as much as digits as its factorization.

11911800640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 524375 (or 524365 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 31.

The spelling of 11911800640 in words is "eleven billion, nine hundred eleven million, eight hundred thousand, six hundred forty".