646360061 has 2 divisors, whose sum is σ = 646360062. Its totient is φ = 646360060.

The previous prime is 646360049. The next prime is 646360129. The reversal of 646360061 is 160063646.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 477204025 + 169156036 = 21845^2 + 13006^2 .

It is a cyclic number.

It is not a de Polignac number, because 646360061 - 2⁶ = 646359997 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (646360021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323180030 + 323180031.

It is an arithmetic number, because the mean of its divisors is an integer number (323180031).

Almost surely, 2^646360061 is an apocalyptic number.

It is an amenable number.

646360061 is a deficient number, since it is larger than the sum of its proper divisors (1).

646360061 is an equidigital number, since it uses as much as digits as its factorization.

646360061 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15552, while the sum is 32.

The square root of 646360061 is about 25423.6122728459. The cubic root of 646360061 is about 864.6191250893.

The spelling of 646360061 in words is "six hundred forty-six million, three hundred sixty thousand, sixty-one".