1640359999 has 2 divisors, whose sum is σ = 1640360000. Its totient is φ = 1640359998.

The previous prime is 1640359997. The next prime is 1640360011. The reversal of 1640359999 is 9999530461.

It is a weak prime.

It is an emirp because it is prime and its reverse (9999530461) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1640359999 - 2¹ = 1640359997 is a prime.

Together with 1640359997, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1640359997) 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, 820179999 + 820180000.

It is an arithmetic number, because the mean of its divisors is an integer number (820180000).

Almost surely, 2^1640359999 is an apocalyptic number.

1640359999 is a deficient number, since it is larger than the sum of its proper divisors (1).

1640359999 is an equidigital number, since it uses as much as digits as its factorization.

1640359999 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2361960, while the sum is 55.

The square root of 1640359999 is about 40501.3579895786. The cubic root of 1640359999 is about 1179.3599897615.

The spelling of 1640359999 in words is "one billion, six hundred forty million, three hundred fifty-nine thousand, nine hundred ninety-nine".