646464959929 has 2 divisors, whose sum is σ = 646464959930. Its totient is φ = 646464959928.

The previous prime is 646464959923. The next prime is 646464959977. The reversal of 646464959929 is 929959464646.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 637258941225 + 9206018704 = 798285^2 + 95948^2 .

It is a cyclic number.

It is not a de Polignac number, because 646464959929 - 2⁵ = 646464959897 is a prime.

It is not a weakly prime, because it can be changed into another prime (646464959923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323232479964 + 323232479965.

It is an arithmetic number, because the mean of its divisors is an integer number (323232479965).

Almost surely, 2^646464959929 is an apocalyptic number.

It is an amenable number.

646464959929 is a deficient number, since it is larger than the sum of its proper divisors (1).

646464959929 is an equidigital number, since it uses as much as digits as its factorization.

646464959929 is an evil number, because the sum of its binary digits is even.

The product of its digits is 906992640, while the sum is 73.

The spelling of 646464959929 in words is "six hundred forty-six billion, four hundred sixty-four million, nine hundred fifty-nine thousand, nine hundred twenty-nine".