123865110105 has 32 divisors (see below), whose sum is σ = 216338992128. Its totient is φ = 60017457600.

The previous prime is 123865110077. The next prime is 123865110107. The reversal of 123865110105 is 501011568321.

It is a happy number.

It is not a de Polignac number, because 123865110105 - 2²³ = 123856721497 is a prime.

It is a super-2 number, since 2×123865110105² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (123865110107) 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 31 ways as a sum of consecutive naturals, for example, 20292 + ... + 498138.

It is an arithmetic number, because the mean of its divisors is an integer number (6760593504).

Almost surely, 2^123865110105 is an apocalyptic number.

123865110105 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

123865110105 is a deficient number, since it is larger than the sum of its proper divisors (92473882023).

123865110105 is a wasteful number, since it uses less digits than its factorization.

123865110105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 479437.

The product of its (nonzero) digits is 7200, while the sum is 33.

Adding to 123865110105 its reverse (501011568321), we get a palindrome (624876678426).

The spelling of 123865110105 in words is "one hundred twenty-three billion, eight hundred sixty-five million, one hundred ten thousand, one hundred five".