12551155123 has 4 divisors (see below), whose sum is σ = 13516628608. Its totient is φ = 11585681640.

The previous prime is 12551155121. The next prime is 12551155129. The reversal of 12551155123 is 32155115521.

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

It is not a de Polignac number, because 12551155123 - 2¹ = 12551155121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12551155121) 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, 482736723 + ... + 482736748.

It is an arithmetic number, because the mean of its divisors is an integer number (3379157152).

Almost surely, 2^12551155123 is an apocalyptic number.

12551155123 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

12551155123 is a deficient number, since it is larger than the sum of its proper divisors (965473485).

12551155123 is an equidigital number, since it uses as much as digits as its factorization.

12551155123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 965473484.

The product of its digits is 7500, while the sum is 31.

The spelling of 12551155123 in words is "twelve billion, five hundred fifty-one million, one hundred fifty-five thousand, one hundred twenty-three".