643343607 has 8 divisors (see below), whose sum is σ = 953101680. Its totient is φ = 428895720.

The previous prime is 643343579. The next prime is 643343609. The reversal of 643343607 is 706343346.

643343607 is a `hidden beast` number, since 6 + 4 + 3 + 3 + 43 + 607 = 666.

It is not a de Polignac number, because 643343607 - 2⁶ = 643343543 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643343609) 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, 11913744 + ... + 11913797.

It is an arithmetic number, because the mean of its divisors is an integer number (119137710).

Almost surely, 2^643343607 is an apocalyptic number.

643343607 is a deficient number, since it is larger than the sum of its proper divisors (309758073).

643343607 is a wasteful number, since it uses less digits than its factorization.

643343607 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23827550 (or 23827544 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 36.

The square root of 643343607 is about 25364.2190299642. The cubic root of 643343607 is about 863.2720165188.

The spelling of 643343607 in words is "six hundred forty-three million, three hundred forty-three thousand, six hundred seven".