15423123505143 has 4 divisors (see below), whose sum is σ = 20564164673528. Its totient is φ = 10282082336760.

The previous prime is 15423123505051. The next prime is 15423123505147. The reversal of 15423123505143 is 34150532132451.

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

It is a de Polignac number, because none of the positive numbers 2^k-15423123505143 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15423123505147) 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, 2570520584188 + ... + 2570520584193.

It is an arithmetic number, because the mean of its divisors is an integer number (5141041168382).

Almost surely, 2^{15423123505143} is an apocalyptic number.

15423123505143 is a deficient number, since it is larger than the sum of its proper divisors (5141041168385).

15423123505143 is an equidigital number, since it uses as much as digits as its factorization.

15423123505143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5141041168384.

The product of its (nonzero) digits is 216000, while the sum is 39.

Adding to 15423123505143 its reverse (34150532132451), we get a palindrome (49573655637594).

The spelling of 15423123505143 in words is "fifteen trillion, four hundred twenty-three billion, one hundred twenty-three million, five hundred five thousand, one hundred forty-three".