123643567550 has 48 divisors (see below), whose sum is σ = 233006991360. Its totient is φ = 48806465760.

The previous prime is 123643567547. The next prime is 123643567559. The reversal of 123643567550 is 55765346321.

123643567550 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 123643567495 and 123643567504.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123643567559) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9026807 + ... + 9040493.

It is an arithmetic number, because the mean of its divisors is an integer number (4854312320).

Almost surely, 2^123643567550 is an apocalyptic number.

123643567550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

123643567550 is a deficient number, since it is larger than the sum of its proper divisors (109363423810).

123643567550 is a wasteful number, since it uses less digits than its factorization.

123643567550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16065 (or 16060 counting only the distinct ones).

The product of its (nonzero) digits is 2268000, while the sum is 47.

The spelling of 123643567550 in words is "one hundred twenty-three billion, six hundred forty-three million, five hundred sixty-seven thousand, five hundred fifty".