646447235773 has 2 divisors, whose sum is σ = 646447235774. Its totient is φ = 646447235772.

The previous prime is 646447235741. The next prime is 646447235831. The reversal of 646447235773 is 377532744646.

It is an a-pointer prime, because the next prime (646447235831) can be obtained adding 646447235773 to its sum of digits (58).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 613585522489 + 32861713284 = 783317^2 + 181278^2 .

It is a cyclic number.

It is not a de Polignac number, because 646447235773 - 2⁵ = 646447235741 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (646447235573) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323223617886 + 323223617887.

It is an arithmetic number, because the mean of its divisors is an integer number (323223617887).

Almost surely, 2^646447235773 is an apocalyptic number.

It is an amenable number.

646447235773 is a deficient number, since it is larger than the sum of its proper divisors (1).

646447235773 is an equidigital number, since it uses as much as digits as its factorization.

646447235773 is an evil number, because the sum of its binary digits is even.

The product of its digits is 71124480, while the sum is 58.

The spelling of 646447235773 in words is "six hundred forty-six billion, four hundred forty-seven million, two hundred thirty-five thousand, seven hundred seventy-three".