1205242106645 has 4 divisors (see below), whose sum is σ = 1446290527980. Its totient is φ = 964193685312.

The previous prime is 1205242106639. The next prime is 1205242106659. The reversal of 1205242106645 is 5466012425021.

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

It can be written as a sum of positive squares in 2 ways, for example, as 214353258289 + 990888848356 = 462983^2 + 995434^2 .

It is a cyclic number.

It is not a de Polignac number, because 1205242106645 - 2¹⁶ = 1205242041109 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1205242106599 and 1205242106608.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 120524210660 + ... + 120524210669.

It is an arithmetic number, because the mean of its divisors is an integer number (361572631995).

Almost surely, 2^{1205242106645} is an apocalyptic number.

It is an amenable number.

1205242106645 is a deficient number, since it is larger than the sum of its proper divisors (241048421335).

1205242106645 is an equidigital number, since it uses as much as digits as its factorization.

1205242106645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 241048421334.

The product of its (nonzero) digits is 115200, while the sum is 38.

The spelling of 1205242106645 in words is "one trillion, two hundred five billion, two hundred forty-two million, one hundred six thousand, six hundred forty-five".