643607422907 has 8 divisors (see below), whose sum is σ = 681560770176. Its totient is φ = 605664529792.

The previous prime is 643607422903. The next prime is 643607422921. The reversal of 643607422907 is 709224706346.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 643607422907 - 2² = 643607422903 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (643607422903) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2486603 + ... + 2733204.

It is an arithmetic number, because the mean of its divisors is an integer number (85195096272).

Almost surely, 2^643607422907 is an apocalyptic number.

643607422907 is a deficient number, since it is larger than the sum of its proper divisors (37953347269).

643607422907 is a wasteful number, since it uses less digits than its factorization.

643607422907 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5227077.

The product of its (nonzero) digits is 3048192, while the sum is 50.

The spelling of 643607422907 in words is "six hundred forty-three billion, six hundred seven million, four hundred twenty-two thousand, nine hundred seven".