12538565506 has 8 divisors (see below), whose sum is σ = 19625580864. Its totient is φ = 5996705220.

The previous prime is 12538565503. The next prime is 12538565537. The reversal of 12538565506 is 60556583521.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Harshad number since it is a multiple of its sum of digits (46), and also a Moran number because the ratio is a prime number: 272577511 = 12538565506 / (1 + 2 + 5 + 3 + 8 + 5 + 6 + 5 + 5 + 0 + 6).

It is not an unprimeable number, because it can be changed into a prime (12538565503) 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, 136288710 + ... + 136288801.

It is an arithmetic number, because the mean of its divisors is an integer number (2453197608).

Almost surely, 2^12538565506 is an apocalyptic number.

12538565506 is a deficient number, since it is larger than the sum of its proper divisors (7087015358).

12538565506 is a wasteful number, since it uses less digits than its factorization.

12538565506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 272577536.

The product of its (nonzero) digits is 1080000, while the sum is 46.

The spelling of 12538565506 in words is "twelve billion, five hundred thirty-eight million, five hundred sixty-five thousand, five hundred six".