643071406630 has 32 divisors (see below), whose sum is σ = 1169549992800. Its totient is φ = 254559571200.

The previous prime is 643071406603. The next prime is 643071406657. The reversal of 643071406630 is 36604170346.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (643071406603) and next prime (643071406657).

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 1968322 + ... + 2271658.

It is an arithmetic number, because the mean of its divisors is an integer number (36548437275).

Almost surely, 2^643071406630 is an apocalyptic number.

643071406630 is a deficient number, since it is larger than the sum of its proper divisors (526478586170).

643071406630 is a wasteful number, since it uses less digits than its factorization.

643071406630 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 305544.

The product of its (nonzero) digits is 217728, while the sum is 40.

Adding to 643071406630 its reverse (36604170346), we get a palindrome (679675576976).

The spelling of 643071406630 in words is "six hundred forty-three billion, seventy-one million, four hundred six thousand, six hundred thirty".