55403120500 has 96 divisors (see below), whose sum is σ = 148923710208. Its totient is φ = 17534160000.

The previous prime is 55403120467. The next prime is 55403120501. The reversal of 55403120500 is 502130455.

It is a super-2 number, since 2×55403120500² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55403120501) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 563326 + ... + 654325.

It is an arithmetic number, because the mean of its divisors is an integer number (1551288648).

Almost surely, 2^55403120500 is an apocalyptic number.

55403120500 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

55403120500 is an abundant number, since it is smaller than the sum of its proper divisors (93520589708).

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

55403120500 is a wasteful number, since it uses less digits than its factorization.

55403120500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1217690 (or 1217678 counting only the distinct ones).

The product of its (nonzero) digits is 3000, while the sum is 25.

Adding to 55403120500 its reverse (502130455), we get a palindrome (55905250955).

The spelling of 55403120500 in words is "fifty-five billion, four hundred three million, one hundred twenty thousand, five hundred".