663768541 has 2 divisors, whose sum is σ = 663768542. Its totient is φ = 663768540.

The previous prime is 663768527. The next prime is 663768571. The reversal of 663768541 is 145867366.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 662856516 + 912025 = 25746^2 + 955^2 .

It is a cyclic number.

It is not a de Polignac number, because 663768541 - 2¹⁵ = 663735773 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 663768491 and 663768500.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (663768571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 331884270 + 331884271.

It is an arithmetic number, because the mean of its divisors is an integer number (331884271).

Almost surely, 2^663768541 is an apocalyptic number.

It is an amenable number.

663768541 is a deficient number, since it is larger than the sum of its proper divisors (1).

663768541 is an equidigital number, since it uses as much as digits as its factorization.

663768541 is an evil number, because the sum of its binary digits is even.

The product of its digits is 725760, while the sum is 46.

The square root of 663768541 is about 25763.7058863821. The cubic root of 663768541 is about 872.3127529805.

The spelling of 663768541 in words is "six hundred sixty-three million, seven hundred sixty-eight thousand, five hundred forty-one".