646645499 has 2 divisors, whose sum is σ = 646645500. Its totient is φ = 646645498.

The previous prime is 646645463. The next prime is 646645561. The reversal of 646645499 is 994546646.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-646645499 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 646645499.

It is not a weakly prime, because it can be changed into another prime (646645409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323322749 + 323322750.

It is an arithmetic number, because the mean of its divisors is an integer number (323322750).

Almost surely, 2^646645499 is an apocalyptic number.

646645499 is a deficient number, since it is larger than the sum of its proper divisors (1).

646645499 is an equidigital number, since it uses as much as digits as its factorization.

646645499 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5598720, while the sum is 53.

The square root of 646645499 is about 25429.2252929577. The cubic root of 646645499 is about 864.7463807004.

The spelling of 646645499 in words is "six hundred forty-six million, six hundred forty-five thousand, four hundred ninety-nine".