12345520440551 has 8 divisors (see below), whose sum is σ = 12368167344000. Its totient is φ = 12322876871680.

The previous prime is 12345520440503. The next prime is 12345520440553. The reversal of 12345520440551 is 15504402554321.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12345520440551 - 2²² = 12345516246247 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12345520440499 and 12345520440508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12345520440553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6639050 + ... + 8292648.

It is an arithmetic number, because the mean of its divisors is an integer number (1546020918000).

Almost surely, 2^{12345520440551} is an apocalyptic number.

12345520440551 is a deficient number, since it is larger than the sum of its proper divisors (22646903449).

12345520440551 is a wasteful number, since it uses less digits than its factorization.

12345520440551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1667289.

The product of its (nonzero) digits is 480000, while the sum is 41.

Adding to 12345520440551 its reverse (15504402554321), we get a palindrome (27849922994872).

The spelling of 12345520440551 in words is "twelve trillion, three hundred forty-five billion, five hundred twenty million, four hundred forty thousand, five hundred fifty-one".