636434434635 has 8 divisors (see below), whose sum is σ = 1018295095440. Its totient is φ = 339431698464.

The previous prime is 636434434631. The next prime is 636434434661. The reversal of 636434434635 is 536434434636.

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

It is not a de Polignac number, because 636434434635 - 2² = 636434434631 is a prime.

It is not an unprimeable number, because it can be changed into a prime (636434434631) 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 7 ways as a sum of consecutive naturals, for example, 21214481140 + ... + 21214481169.

It is an arithmetic number, because the mean of its divisors is an integer number (127286886930).

Almost surely, 2^636434434635 is an apocalyptic number.

636434434635 is a deficient number, since it is larger than the sum of its proper divisors (381860660805).

636434434635 is a wasteful number, since it uses less digits than its factorization.

636434434635 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42428962317.

The product of its digits is 22394880, while the sum is 51.

Subtracting from 636434434635 its reverse (536434434636), we obtain a palindrome (99999999999).

The spelling of 636434434635 in words is "six hundred thirty-six billion, four hundred thirty-four million, four hundred thirty-four thousand, six hundred thirty-five".