646954753 has 2 divisors, whose sum is σ = 646954754. Its totient is φ = 646954752.

The previous prime is 646954751. The next prime is 646954757. The reversal of 646954753 is 357459646.

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., 589906944 + 57047809 = 24288^2 + 7553^2 .

It is a cyclic number.

It is not a de Polignac number, because 646954753 - 2¹ = 646954751 is a prime.

Together with 646954751, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 646954697 and 646954706.

It is not a weakly prime, because it can be changed into another prime (646954751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323477376 + 323477377.

It is an arithmetic number, because the mean of its divisors is an integer number (323477377).

Almost surely, 2^646954753 is an apocalyptic number.

It is an amenable number.

646954753 is a deficient number, since it is larger than the sum of its proper divisors (1).

646954753 is an equidigital number, since it uses as much as digits as its factorization.

646954753 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2721600, while the sum is 49.

The square root of 646954753 is about 25435.3052468414. The cubic root of 646954753 is about 864.8842118394.

The spelling of 646954753 in words is "six hundred forty-six million, nine hundred fifty-four thousand, seven hundred fifty-three".