1664374799 has 2 divisors, whose sum is σ = 1664374800. Its totient is φ = 1664374798.

The previous prime is 1664374793. The next prime is 1664374807. The reversal of 1664374799 is 9974734661.

It is a weak prime.

It is an emirp because it is prime and its reverse (9974734661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1664374799 - 2²⁴ = 1647597583 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1664374793) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 832187399 + 832187400.

It is an arithmetic number, because the mean of its divisors is an integer number (832187400).

Almost surely, 2^1664374799 is an apocalyptic number.

1664374799 is a deficient number, since it is larger than the sum of its proper divisors (1).

1664374799 is an equidigital number, since it uses as much as digits as its factorization.

1664374799 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6858432, while the sum is 56.

The square root of 1664374799 is about 40796.7498582914. The cubic root of 1664374799 is about 1185.0873902804.

The spelling of 1664374799 in words is "one billion, six hundred sixty-four million, three hundred seventy-four thousand, seven hundred ninety-nine".