123751805856 has 48 divisors (see below), whose sum is σ = 371255419584. Its totient is φ = 35357658624.

The previous prime is 123751805797. The next prime is 123751805857. The reversal of 123751805856 is 658508157321.

It is a tau number, because it is divible by the number of its divisors (48).

It is a super-2 number, since 2×123751805856² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 123751805799 and 123751805808.

It is not an unprimeable number, because it can be changed into a prime (123751805857) 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 7 ways as a sum of consecutive naturals, for example, 92076565 + ... + 92077908.

It is an arithmetic number, because the mean of its divisors is an integer number (7734487908).

Almost surely, 2^123751805856 is an apocalyptic number.

123751805856 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

123751805856 is an abundant number, since it is smaller than the sum of its proper divisors (247503613728).

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

123751805856 is a wasteful number, since it uses less digits than its factorization.

123751805856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 184154493 (or 184154485 counting only the distinct ones).

The product of its (nonzero) digits is 2016000, while the sum is 51.

The spelling of 123751805856 in words is "one hundred twenty-three billion, seven hundred fifty-one million, eight hundred five thousand, eight hundred fifty-six".