12123616550 has 24 divisors (see below), whose sum is σ = 22559071752. Its totient is φ = 4847480000.

The previous prime is 12123616541. The next prime is 12123616559. The reversal of 12123616550 is 5561632121.

It is an interprime number because it is at equal distance from previous prime (12123616541) and next prime (12123616559).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12123616559) 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 11 ways as a sum of consecutive naturals, for example, 78650 + ... + 174450.

It is an arithmetic number, because the mean of its divisors is an integer number (939961323).

Almost surely, 2^12123616550 is an apocalyptic number.

12123616550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

12123616550 is a deficient number, since it is larger than the sum of its proper divisors (10435455202).

12123616550 is a wasteful number, since it uses less digits than its factorization.

12123616550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98344 (or 98339 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 32.

The spelling of 12123616550 in words is "twelve billion, one hundred twenty-three million, six hundred sixteen thousand, five hundred fifty".