13515044450423 has 4 divisors (see below), whose sum is σ = 13654374805680. Its totient is φ = 13375714095168.

The previous prime is 13515044450419. The next prime is 13515044450447. The reversal of 13515044450423 is 32405444051531.

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

It is not a de Polignac number, because 13515044450423 - 2² = 13515044450419 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 (13515014450423) 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, 69665177483 + ... + 69665177676.

It is an arithmetic number, because the mean of its divisors is an integer number (3413593701420).

Almost surely, 2^{13515044450423} is an apocalyptic number.

13515044450423 is a deficient number, since it is larger than the sum of its proper divisors (139330355257).

13515044450423 is an equidigital number, since it uses as much as digits as its factorization.

13515044450423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139330355256.

The product of its (nonzero) digits is 576000, while the sum is 41.

The spelling of 13515044450423 in words is "thirteen trillion, five hundred fifteen billion, forty-four million, four hundred fifty thousand, four hundred twenty-three".