12661201511345 has 8 divisors (see below), whose sum is σ = 15196420366440. Its totient is φ = 10126975507200.

The previous prime is 12661201511341. The next prime is 12661201511389. The reversal of 12661201511345 is 54311510216621.

It can be written as a sum of positive squares in 4 ways, for example, as 200640389041 + 12460561122304 = 447929^2 + 3529952^2 .

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

It is not a de Polignac number, because 12661201511345 - 2² = 12661201511341 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 12661201511299 and 12661201511308.

It is not an unprimeable number, because it can be changed into a prime (12661201511341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 248184680 + ... + 248235689.

It is an arithmetic number, because the mean of its divisors is an integer number (1899552545805).

Almost surely, 2^{12661201511345} is an apocalyptic number.

It is an amenable number.

12661201511345 is a deficient number, since it is larger than the sum of its proper divisors (2535218855095).

12661201511345 is an equidigital number, since it uses as much as digits as its factorization.

12661201511345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 496425475.

The product of its (nonzero) digits is 43200, while the sum is 38.

Adding to 12661201511345 its reverse (54311510216621), we get a palindrome (66972711727966).

The spelling of 12661201511345 in words is "twelve trillion, six hundred sixty-one billion, two hundred one million, five hundred eleven thousand, three hundred forty-five".