123171963550 has 24 divisors (see below), whose sum is σ = 229120491600. Its totient is φ = 49264346880.

The previous prime is 123171963547. The next prime is 123171963559. The reversal of 123171963550 is 55369171321.

123171963550 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 = 123171963497 and 123171963506.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123171963559) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 480846 + ... + 691054.

It is an arithmetic number, because the mean of its divisors is an integer number (9546687150).

Almost surely, 2^123171963550 is an apocalyptic number.

123171963550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

123171963550 is a deficient number, since it is larger than the sum of its proper divisors (105948528050).

123171963550 is a wasteful number, since it uses less digits than its factorization.

123171963550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 221940 (or 221935 counting only the distinct ones).

The product of its (nonzero) digits is 170100, while the sum is 43.

The spelling of 123171963550 in words is "one hundred twenty-three billion, one hundred seventy-one million, nine hundred sixty-three thousand, five hundred fifty".