1245424204555 has 16 divisors (see below), whose sum is σ = 1573576175520. Its totient is φ = 943655194368.

The previous prime is 1245424204553. The next prime is 1245424204561. The reversal of 1245424204555 is 5554024245421.

It is a cyclic number.

It is not a de Polignac number, because 1245424204555 - 2¹ = 1245424204553 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1245424204553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1335202 + ... + 2067271.

It is an arithmetic number, because the mean of its divisors is an integer number (98348510970).

Almost surely, 2^{1245424204555} is an apocalyptic number.

1245424204555 is a deficient number, since it is larger than the sum of its proper divisors (328151970965).

1245424204555 is a wasteful number, since it uses less digits than its factorization.

1245424204555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3406350.

The product of its (nonzero) digits is 1280000, while the sum is 43.

Adding to 1245424204555 its reverse (5554024245421), we get a palindrome (6799448449976).

The spelling of 1245424204555 in words is "one trillion, two hundred forty-five billion, four hundred twenty-four million, two hundred four thousand, five hundred fifty-five".