1664940619 has 2 divisors, whose sum is σ = 1664940620. Its totient is φ = 1664940618.

The previous prime is 1664940593. The next prime is 1664940631. The reversal of 1664940619 is 9160494661.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1664940619 - 2¹⁷ = 1664809547 is a prime.

It is a super-2 number, since 2×1664940619² = 5544054529592206322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1664940019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 832470309 + 832470310.

It is an arithmetic number, because the mean of its divisors is an integer number (832470310).

Almost surely, 2^1664940619 is an apocalyptic number.

1664940619 is a deficient number, since it is larger than the sum of its proper divisors (1).

1664940619 is an equidigital number, since it uses as much as digits as its factorization.

1664940619 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 279936, while the sum is 46.

The square root of 1664940619 is about 40803.6838900607. The cubic root of 1664940619 is about 1185.2216689649.

The spelling of 1664940619 in words is "one billion, six hundred sixty-four million, nine hundred forty thousand, six hundred nineteen".