646546653373 has 2 divisors, whose sum is σ = 646546653374. Its totient is φ = 646546653372.

The previous prime is 646546653359. The next prime is 646546653407. The reversal of 646546653373 is 373356645646.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 515025828409 + 131520824964 = 717653^2 + 362658^2 .

It is a cyclic number.

It is not a de Polignac number, because 646546653373 - 2⁵ = 646546653341 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (646546653353) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323273326686 + 323273326687.

It is an arithmetic number, because the mean of its divisors is an integer number (323273326687).

Almost surely, 2^646546653373 is an apocalyptic number.

It is an amenable number.

646546653373 is a deficient number, since it is larger than the sum of its proper divisors (1).

646546653373 is an equidigital number, since it uses as much as digits as its factorization.

646546653373 is an evil number, because the sum of its binary digits is even.

The product of its digits is 97977600, while the sum is 58.

The spelling of 646546653373 in words is "six hundred forty-six billion, five hundred forty-six million, six hundred fifty-three thousand, three hundred seventy-three".