123681455789 has 8 divisors (see below), whose sum is σ = 126037266432. Its totient is φ = 121336233840.

The previous prime is 123681455771. The next prime is 123681455803. The reversal of 123681455789 is 987554186321.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-123681455789 is a prime.

It is a super-2 number, since 2×123681455789² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123681455389) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2623589 + ... + 2670314.

It is an arithmetic number, because the mean of its divisors is an integer number (15754658304).

Almost surely, 2^123681455789 is an apocalyptic number.

It is an amenable number.

123681455789 is a deficient number, since it is larger than the sum of its proper divisors (2355810643).

123681455789 is an equidigital number, since it uses as much as digits as its factorization.

123681455789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5294347.

The product of its digits is 14515200, while the sum is 59.

The spelling of 123681455789 in words is "one hundred twenty-three billion, six hundred eighty-one million, four hundred fifty-five thousand, seven hundred eighty-nine".