643716020959 has 8 divisors (see below), whose sum is σ = 726450682320. Its totient is φ = 565017196800.

The previous prime is 643716020933. The next prime is 643716020971. The reversal of 643716020959 is 959020617346.

It is a happy number.

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 643716020959 - 2⁹ = 643716020447 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643716020929) 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, 1008958962 + ... + 1008959599.

It is an arithmetic number, because the mean of its divisors is an integer number (90806335290).

Almost surely, 2^643716020959 is an apocalyptic number.

643716020959 is a deficient number, since it is larger than the sum of its proper divisors (82734661361).

643716020959 is a wasteful number, since it uses less digits than its factorization.

643716020959 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2017918601.

The product of its (nonzero) digits is 2449440, while the sum is 52.

The spelling of 643716020959 in words is "six hundred forty-three billion, seven hundred sixteen million, twenty thousand, nine hundred fifty-nine".