11871655399920 has 80 divisors (see below), whose sum is σ = 36827886569760. Its totient is φ = 3163559304192.

The previous prime is 11871655399909. The next prime is 11871655399921. The reversal of 11871655399920 is 2999355617811.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11871655399921) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16964679 + ... + 17650598.

It is an arithmetic number, because the mean of its divisors is an integer number (460348582122).

Almost surely, 2^{11871655399920} is an apocalyptic number.

11871655399920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11871655399920 is an abundant number, since it is smaller than the sum of its proper divisors (24956231169840).

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

11871655399920 is a wasteful number, since it uses less digits than its factorization.

11871655399920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34616722 (or 34616716 counting only the distinct ones).

The product of its (nonzero) digits is 36741600, while the sum is 66.

The spelling of 11871655399920 in words is "eleven trillion, eight hundred seventy-one billion, six hundred fifty-five million, three hundred ninety-nine thousand, nine hundred twenty".