643630444036346 has 16 divisors (see below), whose sum is σ = 1039769158299648. Its totient is φ = 297043507508400.

The previous prime is 643630444036331. The next prime is 643630444036379.

643630444036346 is nontrivially palindromic in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 643630444036291 and 643630444036300.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 695254850 + ... + 696179981.

It is an arithmetic number, because the mean of its divisors is an integer number (64985572393728).

Almost surely, 2^{643630444036346} is an apocalyptic number.

643630444036346 is a deficient number, since it is larger than the sum of its proper divisors (396138714263302).

643630444036346 is a wasteful number, since it uses less digits than its factorization.

643630444036346 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1391452637.

The product of its (nonzero) digits is 107495424, while the sum is 56.

The spelling of 643630444036346 in words is "six hundred forty-three trillion, six hundred thirty billion, four hundred forty-four million, thirty-six thousand, three hundred forty-six".