123123520515 has 16 divisors (see below), whose sum is σ = 197150493600. Its totient is φ = 65614924032.

The previous prime is 123123520511. The next prime is 123123520517. The reversal of 123123520515 is 515025321321.

It is not a de Polignac number, because 123123520515 - 2² = 123123520511 is a prime.

It is not an unprimeable number, because it can be changed into a prime (123123520511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3164620 + ... + 3203289.

It is an arithmetic number, because the mean of its divisors is an integer number (12321905850).

Almost surely, 2^123123520515 is an apocalyptic number.

123123520515 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

123123520515 is a deficient number, since it is larger than the sum of its proper divisors (74026973085).

123123520515 is a wasteful number, since it uses less digits than its factorization.

123123520515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6369206.

The product of its (nonzero) digits is 9000, while the sum is 30.

Adding to 123123520515 its reverse (515025321321), we get a palindrome (638148841836).

The spelling of 123123520515 in words is "one hundred twenty-three billion, one hundred twenty-three million, five hundred twenty thousand, five hundred fifteen".