123040442515 has 4 divisors (see below), whose sum is σ = 147648531024. Its totient is φ = 98432354008.

The previous prime is 123040442507. The next prime is 123040442521. The reversal of 123040442515 is 515244040321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 515244040321 = 161561 ⋅3189161.

It is a cyclic number.

It is not a de Polignac number, because 123040442515 - 2³ = 123040442507 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12304044247 + ... + 12304044256.

It is an arithmetic number, because the mean of its divisors is an integer number (36912132756).

Almost surely, 2^123040442515 is an apocalyptic number.

123040442515 is a deficient number, since it is larger than the sum of its proper divisors (24608088509).

123040442515 is an equidigital number, since it uses as much as digits as its factorization.

123040442515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24608088508.

The product of its (nonzero) digits is 19200, while the sum is 31.

Adding to 123040442515 its reverse (515244040321), we get a palindrome (638284482836).

The spelling of 123040442515 in words is "one hundred twenty-three billion, forty million, four hundred forty-two thousand, five hundred fifteen".