15555425123 has 4 divisors (see below), whose sum is σ = 17777628720. Its totient is φ = 13333221528.

The previous prime is 15555425069. The next prime is 15555425131. The reversal of 15555425123 is 32152455551.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32152455551 = 1873 ⋅17166287.

It is a cyclic number.

It is not a de Polignac number, because 15555425123 - 2⁸ = 15555424867 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15555425183) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1111101788 + ... + 1111101801.

It is an arithmetic number, because the mean of its divisors is an integer number (4444407180).

Almost surely, 2^15555425123 is an apocalyptic number.

15555425123 is a deficient number, since it is larger than the sum of its proper divisors (2222203597).

15555425123 is an equidigital number, since it uses as much as digits as its factorization.

15555425123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2222203596.

The product of its digits is 150000, while the sum is 38.

The spelling of 15555425123 in words is "fifteen billion, five hundred fifty-five million, four hundred twenty-five thousand, one hundred twenty-three".