55111400400 has 120 divisors (see below), whose sum is σ = 201760243264. Its totient is φ = 12596889600.

The previous prime is 55111400363. The next prime is 55111400401. The reversal of 55111400400 is 400411155.

It is a tau number, because it is divible by the number of its divisors (120).

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55111400401) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 3272041 + ... + 3288840.

Almost surely, 2^55111400400 is an apocalyptic number.

55111400400 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

55111400400 is an abundant number, since it is smaller than the sum of its proper divisors (146648842864).

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

55111400400 is a wasteful number, since it uses less digits than its factorization.

55111400400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6560909 (or 6560898 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 21.

Adding to 55111400400 its reverse (400411155), we get a palindrome (55511811555).

The spelling of 55111400400 in words is "fifty-five billion, one hundred eleven million, four hundred thousand, four hundred".