643071406632 has 32 divisors (see below), whose sum is σ = 1631673722400. Its totient is φ = 211157774784.

The previous prime is 643071406603. The next prime is 643071406657. The reversal of 643071406632 is 236604170346.

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, 199958407 + ... + 199961622.

It is an arithmetic number, because the mean of its divisors is an integer number (50989803825).

Almost surely, 2^643071406632 is an apocalyptic number.

It is an amenable number.

643071406632 is an abundant number, since it is smaller than the sum of its proper divisors (988602315768).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

643071406632 is a wasteful number, since it uses less digits than its factorization.

643071406632 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 399920105 (or 399920101 counting only the distinct ones).

The product of its (nonzero) digits is 435456, while the sum is 42.

Adding to 643071406632 its reverse (236604170346), we get a palindrome (879675576978).

The spelling of 643071406632 in words is "six hundred forty-three billion, seventy-one million, four hundred six thousand, six hundred thirty-two".