1193664564821 has 4 divisors (see below), whose sum is σ = 1193675211072. Its totient is φ = 1193653918572.

The previous prime is 1193664564817. The next prime is 1193664564853. The reversal of 1193664564821 is 1284654663911.

It is a happy number.

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 1193664564821 - 2² = 1193664564817 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1193664564811) 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, 5153135 + ... + 5379788.

It is an arithmetic number, because the mean of its divisors is an integer number (298418802768).

Almost surely, 2^{1193664564821} is an apocalyptic number.

It is an amenable number.

1193664564821 is a deficient number, since it is larger than the sum of its proper divisors (10646251).

1193664564821 is a wasteful number, since it uses less digits than its factorization.

1193664564821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10646250.

The product of its digits is 7464960, while the sum is 56.

The spelling of 1193664564821 in words is "one trillion, one hundred ninety-three billion, six hundred sixty-four million, five hundred sixty-four thousand, eight hundred twenty-one".