12340361215665 has 80 divisors (see below), whose sum is σ = 25285848192000. Its totient is φ = 5640319267200.

The previous prime is 12340361215661. The next prime is 12340361215667. The reversal of 12340361215665 is 56651216304321.

It is a happy number.

12340361215665 is a `hidden beast` number, since 1 + 2 + 3 + 4 + 0 + 3 + 61 + 21 + 566 + 5 = 666.

It is not a de Polignac number, because 12340361215665 - 2² = 12340361215661 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 12340361215665.

It is not an unprimeable number, because it can be changed into a prime (12340361215661) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 15919840 + ... + 16676990.

It is an arithmetic number, because the mean of its divisors is an integer number (316073102400).

Almost surely, 2^{12340361215665} is an apocalyptic number.

12340361215665 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12340361215665 is an abundant number, since it is smaller than the sum of its proper divisors (12945486976335).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12340361215665 is an equidigital number, since it uses as much as digits as its factorization.

12340361215665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 762924 (or 762915 counting only the distinct ones).

The product of its (nonzero) digits is 777600, while the sum is 45.

Adding to 12340361215665 its reverse (56651216304321), we get a palindrome (68991577519986).

The spelling of 12340361215665 in words is "twelve trillion, three hundred forty billion, three hundred sixty-one million, two hundred fifteen thousand, six hundred sixty-five".