6400646501 has 2 divisors, whose sum is σ = 6400646502. Its totient is φ = 6400646500.

The previous prime is 6400646453. The next prime is 6400646513. The reversal of 6400646501 is 1056460046.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5427268900 + 973377601 = 73670^2 + 31199^2 .

It is a cyclic number.

It is not a de Polignac number, because 6400646501 - 2³⁰ = 5326904677 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6400646531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3200323250 + 3200323251.

It is an arithmetic number, because the mean of its divisors is an integer number (3200323251).

Almost surely, 2^6400646501 is an apocalyptic number.

It is an amenable number.

6400646501 is a deficient number, since it is larger than the sum of its proper divisors (1).

6400646501 is an equidigital number, since it uses as much as digits as its factorization.

6400646501 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17280, while the sum is 32.

The square root of 6400646501 is about 80004.0405292133. The cubic root of 6400646501 is about 1856.6980478365.

The spelling of 6400646501 in words is "six billion, four hundred million, six hundred forty-six thousand, five hundred one".