1206643489361 has 4 divisors (see below), whose sum is σ = 1259106249792. Its totient is φ = 1154180728932.

The previous prime is 1206643489339. The next prime is 1206643489367. The reversal of 1206643489361 is 1639843466021.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1206643489361 - 2³⁰ = 1205569747537 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1206643489367) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26231380181 + ... + 26231380226.

It is an arithmetic number, because the mean of its divisors is an integer number (314776562448).

Almost surely, 2^{1206643489361} is an apocalyptic number.

It is an amenable number.

1206643489361 is a deficient number, since it is larger than the sum of its proper divisors (52462760431).

1206643489361 is an equidigital number, since it uses as much as digits as its factorization.

1206643489361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52462760430.

The product of its (nonzero) digits is 4478976, while the sum is 53.

The spelling of 1206643489361 in words is "one trillion, two hundred six billion, six hundred forty-three million, four hundred eighty-nine thousand, three hundred sixty-one".