1213652312066 has 4 divisors (see below), whose sum is σ = 1820478468102. Its totient is φ = 606826156032.

The previous prime is 1213652312057. The next prime is 1213652312069. The reversal of 1213652312066 is 6602132563121.

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

It can be written as a sum of positive squares in only one way, i.e., 612141936025 + 601510376041 = 782395^2 + 775571^2 .

It is not an unprimeable number, because it can be changed into a prime (1213652312069) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 303413078015 + ... + 303413078018.

Almost surely, 2^{1213652312066} is an apocalyptic number.

1213652312066 is a deficient number, since it is larger than the sum of its proper divisors (606826156036).

1213652312066 is an equidigital number, since it uses as much as digits as its factorization.

1213652312066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 606826156035.

The product of its (nonzero) digits is 77760, while the sum is 38.

Adding to 1213652312066 its reverse (6602132563121), we get a palindrome (7815784875187).

The spelling of 1213652312066 in words is "one trillion, two hundred thirteen billion, six hundred fifty-two million, three hundred twelve thousand, sixty-six".