1564345999 has 2 divisors, whose sum is σ = 1564346000. Its totient is φ = 1564345998.

The previous prime is 1564345987. The next prime is 1564346009. The reversal of 1564345999 is 9995434651.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1564345999 - 2¹¹ = 1564343951 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1564345919) 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, 782172999 + 782173000.

It is an arithmetic number, because the mean of its divisors is an integer number (782173000).

Almost surely, 2^1564345999 is an apocalyptic number.

1564345999 is a deficient number, since it is larger than the sum of its proper divisors (1).

1564345999 is an equidigital number, since it uses as much as digits as its factorization.

1564345999 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5248800, while the sum is 55.

The square root of 1564345999 is about 39551.8141050445. The cubic root of 1564345999 is about 1160.8540082017.

The spelling of 1564345999 in words is "one billion, five hundred sixty-four million, three hundred forty-five thousand, nine hundred ninety-nine".