123015356412 has 192 divisors, whose sum is σ = 330424012800. Its totient is φ = 35286036480.

The previous prime is 123015356383. The next prime is 123015356413. The reversal of 123015356412 is 214653510321.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123015356413) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 227384862 + ... + 227385402.

It is an arithmetic number, because the mean of its divisors is an integer number (1720958400).

Almost surely, 2^123015356412 is an apocalyptic number.

123015356412 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 123015356412, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (165212006400).

123015356412 is an abundant number, since it is smaller than the sum of its proper divisors (207408656388).

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

123015356412 is a wasteful number, since it uses less digits than its factorization.

123015356412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1236 (or 1234 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 33.

Adding to 123015356412 its reverse (214653510321), we get a palindrome (337668866733).

The spelling of 123015356412 in words is "one hundred twenty-three billion, fifteen million, three hundred fifty-six thousand, four hundred twelve".