1240320443551 has 16 divisors (see below), whose sum is σ = 1440229835520. Its totient is φ = 1046204470080.

The previous prime is 1240320443473. The next prime is 1240320443611. The reversal of 1240320443551 is 1553440230421.

It is not a de Polignac number, because 1240320443551 - 2⁹ = 1240320443039 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1240330443551) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 4586281 + ... + 4849186.

It is an arithmetic number, because the mean of its divisors is an integer number (90014364720).

Almost surely, 2^{1240320443551} is an apocalyptic number.

1240320443551 is a deficient number, since it is larger than the sum of its proper divisors (199909391969).

1240320443551 is an equidigital number, since it uses as much as digits as its factorization.

1240320443551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9435774.

The product of its (nonzero) digits is 57600, while the sum is 34.

Adding to 1240320443551 its reverse (1553440230421), we get a palindrome (2793760673972).

The spelling of 1240320443551 in words is "one trillion, two hundred forty billion, three hundred twenty million, four hundred forty-three thousand, five hundred fifty-one".