646270673 has 2 divisors, whose sum is σ = 646270674. Its totient is φ = 646270672.

The previous prime is 646270649. The next prime is 646270687. The reversal of 646270673 is 376072646.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 541167169 + 105103504 = 23263^2 + 10252^2 .

It is a cyclic number.

It is not a de Polignac number, because 646270673 - 2¹⁰ = 646269649 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 646270673.

It is not a weakly prime, because it can be changed into another prime (646270643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323135336 + 323135337.

It is an arithmetic number, because the mean of its divisors is an integer number (323135337).

Almost surely, 2^646270673 is an apocalyptic number.

It is an amenable number.

646270673 is a deficient number, since it is larger than the sum of its proper divisors (1).

646270673 is an equidigital number, since it uses as much as digits as its factorization.

646270673 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 254016, while the sum is 41.

The square root of 646270673 is about 25421.8542400038. The cubic root of 646270673 is about 864.5792659137.

The spelling of 646270673 in words is "six hundred forty-six million, two hundred seventy thousand, six hundred seventy-three".