123545510015 has 4 divisors (see below), whose sum is σ = 148254612024. Its totient is φ = 98836408008.

The previous prime is 123545510003. The next prime is 123545510047. The reversal of 123545510015 is 510015545321.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 123545510015 - 2¹⁰ = 123545508991 is a prime.

It is a Duffinian number.

It is a congruent 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, 12354550997 + ... + 12354551006.

It is an arithmetic number, because the mean of its divisors is an integer number (37063653006).

Almost surely, 2^123545510015 is an apocalyptic number.

123545510015 is a deficient number, since it is larger than the sum of its proper divisors (24709102009).

123545510015 is an equidigital number, since it uses as much as digits as its factorization.

123545510015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24709102008.

The product of its (nonzero) digits is 15000, while the sum is 32.

The spelling of 123545510015 in words is "one hundred twenty-three billion, five hundred forty-five million, five hundred ten thousand, fifteen".