664557681163 has 2 divisors, whose sum is σ = 664557681164. Its totient is φ = 664557681162.

The previous prime is 664557681091. The next prime is 664557681181. The reversal of 664557681163 is 361186755466.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-664557681163 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 664557681098 and 664557681107.

It is not a weakly prime, because it can be changed into another prime (664557781163) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332278840581 + 332278840582.

It is an arithmetic number, because the mean of its divisors is an integer number (332278840582).

Almost surely, 2^664557681163 is an apocalyptic number.

664557681163 is a deficient number, since it is larger than the sum of its proper divisors (1).

664557681163 is an equidigital number, since it uses as much as digits as its factorization.

664557681163 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21772800, while the sum is 58.

The spelling of 664557681163 in words is "six hundred sixty-four billion, five hundred fifty-seven million, six hundred eighty-one thousand, one hundred sixty-three".