12157105459 has 4 divisors (see below), whose sum is σ = 12158233416. Its totient is φ = 12155977504.

The previous prime is 12157105451. The next prime is 12157105463. The reversal of 12157105459 is 95450175121.

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

It is a cyclic number.

It is not a de Polignac number, because 12157105459 - 2³ = 12157105451 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12157105451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 547654 + ... + 569419.

It is an arithmetic number, because the mean of its divisors is an integer number (3039558354).

Almost surely, 2^12157105459 is an apocalyptic number.

12157105459 is a deficient number, since it is larger than the sum of its proper divisors (1127957).

12157105459 is a wasteful number, since it uses less digits than its factorization.

12157105459 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1127956.

The product of its (nonzero) digits is 63000, while the sum is 40.

The spelling of 12157105459 in words is "twelve billion, one hundred fifty-seven million, one hundred five thousand, four hundred fifty-nine".