643135404531346 has 16 divisors (see below), whose sum is σ = 1004577795627840. Its totient is φ = 308423007421200.

The previous prime is 643135404531337. The next prime is 643135404531397.

643135404531346 is nontrivially palindromic in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 643135404531293 and 643135404531302.

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, 36717015936 + ... + 36717033451.

It is an arithmetic number, because the mean of its divisors is an integer number (62786112226740).

Almost surely, 2^{643135404531346} is an apocalyptic number.

643135404531346 is a deficient number, since it is larger than the sum of its proper divisors (361442391096494).

643135404531346 is a wasteful number, since it uses less digits than its factorization.

643135404531346 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73434049569.

The product of its (nonzero) digits is 18662400, while the sum is 52.

It can be divided in two parts, 64313540 and 4531346, that added together give a palindrome (68844886).

The spelling of 643135404531346 in words is "six hundred forty-three trillion, one hundred thirty-five billion, four hundred four million, five hundred thirty-one thousand, three hundred forty-six".