1663751513 has 2 divisors, whose sum is σ = 1663751514. Its totient is φ = 1663751512.

The previous prime is 1663751497. The next prime is 1663751521. The reversal of 1663751513 is 3151573661.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1046328409 + 617423104 = 32347^2 + 24848^2 .

It is a cyclic number.

It is not a de Polignac number, because 1663751513 - 2⁴ = 1663751497 is a prime.

It is not a weakly prime, because it can be changed into another prime (1663751533) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 831875756 + 831875757.

It is an arithmetic number, because the mean of its divisors is an integer number (831875757).

Almost surely, 2^1663751513 is an apocalyptic number.

It is an amenable number.

1663751513 is a deficient number, since it is larger than the sum of its proper divisors (1).

1663751513 is an equidigital number, since it uses as much as digits as its factorization.

1663751513 is an evil number, because the sum of its binary digits is even.

The product of its digits is 56700, while the sum is 38.

The square root of 1663751513 is about 40789.1102256472. The cubic root of 1663751513 is about 1184.9394387086.

The spelling of 1663751513 in words is "one billion, six hundred sixty-three million, seven hundred fifty-one thousand, five hundred thirteen".