642636363603 has 32 divisors (see below), whose sum is σ = 996082698240. Its totient is φ = 365230293120.

The previous prime is 642636363601. The next prime is 642636363623. The reversal of 642636363603 is 306363636246.

It is a happy number.

It is not a de Polignac number, because 642636363603 - 2¹ = 642636363601 is a prime.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (642636363601) 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 31 ways as a sum of consecutive naturals, for example, 12326203 + ... + 12378228.

It is an arithmetic number, because the mean of its divisors is an integer number (31127584320).

Almost surely, 2^642636363603 is an apocalyptic number.

642636363603 is a deficient number, since it is larger than the sum of its proper divisors (353446334637).

642636363603 is a wasteful number, since it uses less digits than its factorization.

642636363603 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24704499.

The product of its (nonzero) digits is 5038848, while the sum is 48.

Adding to 642636363603 its reverse (306363636246), we get a palindrome (948999999849).

The spelling of 642636363603 in words is "six hundred forty-two billion, six hundred thirty-six million, three hundred sixty-three thousand, six hundred three".