55051000400 has 120 divisors (see below), whose sum is σ = 144390695904. Its totient is φ = 20003699200.

The previous prime is 55051000391. The next prime is 55051000409. The reversal of 55051000400 is 400015055.

It is an interprime number because it is at equal distance from previous prime (55051000391) and next prime (55051000409).

It is a super-2 number, since 2×55051000400² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55051000409) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7198979 + ... + 7206621.

Almost surely, 2^55051000400 is an apocalyptic number.

55051000400 is a gapful number since it is divisible by the number (50) 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 55051000400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (72195347952).

55051000400 is an abundant number, since it is smaller than the sum of its proper divisors (89339695504).

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

55051000400 is a wasteful number, since it uses less digits than its factorization.

55051000400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9309 (or 9298 counting only the distinct ones).

The product of its (nonzero) digits is 500, while the sum is 20.

Adding to 55051000400 its reverse (400015055), we get a palindrome (55451015455).

The spelling of 55051000400 in words is "fifty-five billion, fifty-one million, four hundred", and thus it is an aban number.