646425797 has 2 divisors, whose sum is σ = 646425798. Its totient is φ = 646425796.

The previous prime is 646425761. The next prime is 646425817. The reversal of 646425797 is 797524646.

646425797 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 597998116 + 48427681 = 24454^2 + 6959^2 .

It is a cyclic number.

It is not a de Polignac number, because 646425797 - 2²⁰ = 645377221 is a prime.

It is a super-2 number, since 2×646425797² = 835732622054170418, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (646425737) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323212898 + 323212899.

It is an arithmetic number, because the mean of its divisors is an integer number (323212899).

Almost surely, 2^646425797 is an apocalyptic number.

It is an amenable number.

646425797 is a deficient number, since it is larger than the sum of its proper divisors (1).

646425797 is an equidigital number, since it uses as much as digits as its factorization.

646425797 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2540160, while the sum is 50.

The square root of 646425797 is about 25424.9050539033. The cubic root of 646425797 is about 864.6484352110.

The spelling of 646425797 in words is "six hundred forty-six million, four hundred twenty-five thousand, seven hundred ninety-seven".