646464261229 has 2 divisors, whose sum is σ = 646464261230. Its totient is φ = 646464261228.

The previous prime is 646464261221. The next prime is 646464261251. The reversal of 646464261229 is 922162464646.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 595980912004 + 50483349225 = 771998^2 + 224685^2 .

It is a cyclic number.

It is not a de Polignac number, because 646464261229 - 2³ = 646464261221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (646464261221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323232130614 + 323232130615.

It is an arithmetic number, because the mean of its divisors is an integer number (323232130615).

Almost surely, 2^646464261229 is an apocalyptic number.

It is an amenable number.

646464261229 is a deficient number, since it is larger than the sum of its proper divisors (1).

646464261229 is an equidigital number, since it uses as much as digits as its factorization.

646464261229 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5971968, while the sum is 52.

The spelling of 646464261229 in words is "six hundred forty-six billion, four hundred sixty-four million, two hundred sixty-one thousand, two hundred twenty-nine".