1264323561161 has 4 divisors (see below), whose sum is σ = 1276841616324. Its totient is φ = 1251805506000.

The previous prime is 1264323561119. The next prime is 1264323561181. The reversal of 1264323561161 is 1611653234621.

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 624011523136 + 640312038025 = 789944^2 + 800195^2 .

It is a cyclic number.

It is not a de Polignac number, because 1264323561161 - 2⁶ = 1264323561097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1264323561181) 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, 6259027430 + ... + 6259027631.

It is an arithmetic number, because the mean of its divisors is an integer number (319210404081).

Almost surely, 2^{1264323561161} is an apocalyptic number.

It is an amenable number.

1264323561161 is a deficient number, since it is larger than the sum of its proper divisors (12518055163).

1264323561161 is a wasteful number, since it uses less digits than its factorization.

1264323561161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12518055162.

The product of its digits is 155520, while the sum is 41.

Adding to 1264323561161 its reverse (1611653234621), we get a palindrome (2875976795782).

The spelling of 1264323561161 in words is "one trillion, two hundred sixty-four billion, three hundred twenty-three million, five hundred sixty-one thousand, one hundred sixty-one".