123130400550 has 48 divisors (see below), whose sum is σ = 306945659280. Its totient is φ = 32664637440.

The previous prime is 123130400509. The next prime is 123130400621. The reversal of 123130400550 is 55004031321.

It is a super-2 number, since 2×123130400550² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 123130400550.

It is a congruent number.

It is an unprimeable number.

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, 2097655 + ... + 2155554.

It is an arithmetic number, because the mean of its divisors is an integer number (6394701235).

Almost surely, 2^123130400550 is an apocalyptic number.

123130400550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

123130400550 is an abundant number, since it is smaller than the sum of its proper divisors (183815258730).

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

123130400550 is a wasteful number, since it uses less digits than its factorization.

123130400550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4253417 (or 4253412 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 24.

Adding to 123130400550 its reverse (55004031321), we get a palindrome (178134431871).

The spelling of 123130400550 in words is "one hundred twenty-three billion, one hundred thirty million, four hundred thousand, five hundred fifty".