11855117420 has 24 divisors (see below), whose sum is σ = 25195698864. Its totient is φ = 4684913216.

The previous prime is 11855117419. The next prime is 11855117509. The reversal of 11855117420 is 2471155811.

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, 3569159 + ... + 3572478.

It is an arithmetic number, because the mean of its divisors is an integer number (1049820786).

Almost surely, 2^11855117420 is an apocalyptic number.

11855117420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11855117420 is an abundant number, since it is smaller than the sum of its proper divisors (13340581444).

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

11855117420 is a wasteful number, since it uses less digits than its factorization.

11855117420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7141729 (or 7141727 counting only the distinct ones).

The product of its (nonzero) digits is 11200, while the sum is 35.

The spelling of 11855117420 in words is "eleven billion, eight hundred fifty-five million, one hundred seventeen thousand, four hundred twenty".