12456200165 has 4 divisors (see below), whose sum is σ = 14947440204. Its totient is φ = 9964960128.

The previous prime is 12456200129. The next prime is 12456200173. The reversal of 12456200165 is 56100265421.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 56100265421 = 17 ⋅3300015613.

It can be written as a sum of positive squares in 2 ways, for example, as 9532202689 + 2923997476 = 97633^2 + 54074^2 .

It is a cyclic number.

It is not a de Polignac number, because 12456200165 - 2¹² = 12456196069 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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, 1245620012 + ... + 1245620021.

It is an arithmetic number, because the mean of its divisors is an integer number (3736860051).

Almost surely, 2^12456200165 is an apocalyptic number.

It is an amenable number.

12456200165 is a deficient number, since it is larger than the sum of its proper divisors (2491240039).

12456200165 is an equidigital number, since it uses as much as digits as its factorization.

12456200165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2491240038.

The product of its (nonzero) digits is 14400, while the sum is 32.

Adding to 12456200165 its reverse (56100265421), we get a palindrome (68556465586).

The spelling of 12456200165 in words is "twelve billion, four hundred fifty-six million, two hundred thousand, one hundred sixty-five".