643635404536346 has 16 divisors (see below), whose sum is σ = 970011582306048. Its totient is φ = 320300864570400.

The previous prime is 643635404536331. The next prime is 643635404536361.

643635404536346 is nontrivially palindromic in base 10.

It is an interprime number because it is at equal distance from previous prime (643635404536331) and next prime (643635404536361).

It is an unprimeable number.

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, 663048440 + ... + 664018451.

It is an arithmetic number, because the mean of its divisors is an integer number (60625723894128).

Almost surely, 2^{643635404536346} is an apocalyptic number.

643635404536346 is a deficient number, since it is larger than the sum of its proper divisors (326376177769702).

643635404536346 is a wasteful number, since it uses less digits than its factorization.

643635404536346 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1327068037.

The product of its (nonzero) digits is 671846400, while the sum is 62.

It can be divided in two parts, 64363540 and 4536346, that added together give a palindrome (68899886).

The spelling of 643635404536346 in words is "six hundred forty-three trillion, six hundred thirty-five billion, four hundred four million, five hundred thirty-six thousand, three hundred forty-six".