641650643 has 8 divisors (see below), whose sum is σ = 661359456. Its totient is φ = 622238400.

The previous prime is 641650637. The next prime is 641650657. The reversal of 641650643 is 346056146.

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 641650643 - 2⁶ = 641650579 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (641650663) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 69746 + ... + 78407.

It is an arithmetic number, because the mean of its divisors is an integer number (82669932).

Almost surely, 2^641650643 is an apocalyptic number.

641650643 is a deficient number, since it is larger than the sum of its proper divisors (19708813).

641650643 is a wasteful number, since it uses less digits than its factorization.

641650643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148285.

The product of its (nonzero) digits is 51840, while the sum is 35.

The square root of 641650643 is about 25330.8239700172. The cubic root of 641650643 is about 862.5141155150.

The spelling of 641650643 in words is "six hundred forty-one million, six hundred fifty thousand, six hundred forty-three".