1663763573 has 2 divisors, whose sum is σ = 1663763574. Its totient is φ = 1663763572.

The previous prime is 1663763561. The next prime is 1663763603. The reversal of 1663763573 is 3753673661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1469802244 + 193961329 = 38338^2 + 13927^2 .

It is a cyclic number.

It is not a de Polignac number, because 1663763573 - 2¹⁰ = 1663762549 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1663763533) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 831881786 + 831881787.

It is an arithmetic number, because the mean of its divisors is an integer number (831881787).

Almost surely, 2^1663763573 is an apocalyptic number.

It is an amenable number.

1663763573 is a deficient number, since it is larger than the sum of its proper divisors (1).

1663763573 is an equidigital number, since it uses as much as digits as its factorization.

1663763573 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1428840, while the sum is 47.

The square root of 1663763573 is about 40789.2580589547. The cubic root of 1663763573 is about 1184.9423017834.

The spelling of 1663763573 in words is "one billion, six hundred sixty-three million, seven hundred sixty-three thousand, five hundred seventy-three".