55420432500 has 120 divisors (see below), whose sum is σ = 162432704896. Its totient is φ = 14701824000.

The previous prime is 55420432493. The next prime is 55420432553. The reversal of 55420432500 is 523402455.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 1428357 + ... + 1466643.

Almost surely, 2^55420432500 is an apocalyptic number.

55420432500 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 55420432500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (81216352448).

55420432500 is an abundant number, since it is smaller than the sum of its proper divisors (107012272396).

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

55420432500 is a wasteful number, since it uses less digits than its factorization.

55420432500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38507 (or 38490 counting only the distinct ones).

The product of its (nonzero) digits is 24000, while the sum is 30.

Adding to 55420432500 its reverse (523402455), we get a palindrome (55943834955).

The spelling of 55420432500 in words is "fifty-five billion, four hundred twenty million, four hundred thirty-two thousand, five hundred".