643063620605 has 16 divisors (see below), whose sum is σ = 882593760384. Its totient is φ = 440618942400.

The previous prime is 643063620599. The next prime is 643063620631. The reversal of 643063620605 is 506026360346.

It is not a de Polignac number, because 643063620605 - 2²⁶ = 642996511741 is a prime.

It is a super-2 number, since 2×643063620605² (a number of 24 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7015667 + ... + 7106736.

It is an arithmetic number, because the mean of its divisors is an integer number (55162110024).

Almost surely, 2^643063620605 is an apocalyptic number.

It is an amenable number.

643063620605 is a deficient number, since it is larger than the sum of its proper divisors (239530139779).

643063620605 is a wasteful number, since it uses less digits than its factorization.

643063620605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14123716.

The product of its (nonzero) digits is 466560, while the sum is 41.

The spelling of 643063620605 in words is "six hundred forty-three billion, sixty-three million, six hundred twenty thousand, six hundred five".