1663960819 has 2 divisors, whose sum is σ = 1663960820. Its totient is φ = 1663960818.

The previous prime is 1663960813. The next prime is 1663960841. The reversal of 1663960819 is 9180693661.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1663960819 is a prime.

It is a super-2 number, since 2×1663960819² = 5537531214334301522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1663960813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 831980409 + 831980410.

It is an arithmetic number, because the mean of its divisors is an integer number (831980410).

Almost surely, 2^1663960819 is an apocalyptic number.

1663960819 is a deficient number, since it is larger than the sum of its proper divisors (1).

1663960819 is an equidigital number, since it uses as much as digits as its factorization.

1663960819 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 419904, while the sum is 49.

The square root of 1663960819 is about 40791.6758542720. The cubic root of 1663960819 is about 1184.9891265240.

The spelling of 1663960819 in words is "one billion, six hundred sixty-three million, nine hundred sixty thousand, eight hundred nineteen".