646546653407 has 2 divisors, whose sum is σ = 646546653408. Its totient is φ = 646546653406.

The previous prime is 646546653373. The next prime is 646546653409. The reversal of 646546653407 is 704356645646.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 646546653407 - 2¹⁶ = 646546587871 is a prime.

Together with 646546653409, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (646546653409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323273326703 + 323273326704.

It is an arithmetic number, because the mean of its divisors is an integer number (323273326704).

Almost surely, 2^646546653407 is an apocalyptic number.

646546653407 is a deficient number, since it is larger than the sum of its proper divisors (1).

646546653407 is an equidigital number, since it uses as much as digits as its factorization.

646546653407 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 43545600, while the sum is 56.

The spelling of 646546653407 in words is "six hundred forty-six billion, five hundred forty-six million, six hundred fifty-three thousand, four hundred seven".