663955409471 has 2 divisors, whose sum is σ = 663955409472. Its totient is φ = 663955409470.

The previous prime is 663955409443. The next prime is 663955409543. The reversal of 663955409471 is 174904559366.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 663955409471 - 2⁶ = 663955409407 is a prime.

It is a super-3 number, since 3×663955409471³ (a number of 36 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 663955409471.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (663955409771) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 331977704735 + 331977704736.

It is an arithmetic number, because the mean of its divisors is an integer number (331977704736).

Almost surely, 2^663955409471 is an apocalyptic number.

663955409471 is a deficient number, since it is larger than the sum of its proper divisors (1).

663955409471 is an equidigital number, since it uses as much as digits as its factorization.

663955409471 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24494400, while the sum is 59.

The spelling of 663955409471 in words is "six hundred sixty-three billion, nine hundred fifty-five million, four hundred nine thousand, four hundred seventy-one".