650421643 has 2 divisors, whose sum is σ = 650421644. Its totient is φ = 650421642.

The previous prime is 650421593. The next prime is 650421691. The reversal of 650421643 is 346124056.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 650421643 - 2²¹ = 648324491 is a prime.

It is not a weakly prime, because it can be changed into another prime (650421043) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 325210821 + 325210822.

It is an arithmetic number, because the mean of its divisors is an integer number (325210822).

Almost surely, 2^650421643 is an apocalyptic number.

650421643 is a deficient number, since it is larger than the sum of its proper divisors (1).

650421643 is an equidigital number, since it uses as much as digits as its factorization.

650421643 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17280, while the sum is 31.

The square root of 650421643 is about 25503.3653269524. The cubic root of 650421643 is about 866.4263692937.

Adding to 650421643 its reverse (346124056), we get a palindrome (996545699).

The spelling of 650421643 in words is "six hundred fifty million, four hundred twenty-one thousand, six hundred forty-three".