1145568633821 has 4 divisors (see below), whose sum is σ = 1145584765500. Its totient is φ = 1145552502144.

The previous prime is 1145568633767. The next prime is 1145568633851. The reversal of 1145568633821 is 1283368655411.

It is a happy number.

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 187497660100 + 958070973721 = 433010^2 + 978811^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1145568633821 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 (1145568633851) 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, 7958846 + ... + 8101503.

It is an arithmetic number, because the mean of its divisors is an integer number (286396191375).

Almost surely, 2^{1145568633821} is an apocalyptic number.

It is an amenable number.

1145568633821 is a deficient number, since it is larger than the sum of its proper divisors (16131679).

1145568633821 is an equidigital number, since it uses as much as digits as its factorization.

1145568633821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16131678.

The product of its digits is 4147200, while the sum is 53.

The spelling of 1145568633821 in words is "one trillion, one hundred forty-five billion, five hundred sixty-eight million, six hundred thirty-three thousand, eight hundred twenty-one".