664104641 has 2 divisors, whose sum is σ = 664104642. Its totient is φ = 664104640.

The previous prime is 664104619. The next prime is 664104647. The reversal of 664104641 is 146401466.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 643890625 + 20214016 = 25375^2 + 4496^2 .

It is a cyclic number.

It is not a de Polignac number, because 664104641 - 2¹⁰ = 664103617 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 664104598 and 664104607.

It is not a weakly prime, because it can be changed into another prime (664104647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332052320 + 332052321.

It is an arithmetic number, because the mean of its divisors is an integer number (332052321).

Almost surely, 2^664104641 is an apocalyptic number.

It is an amenable number.

664104641 is a deficient number, since it is larger than the sum of its proper divisors (1).

664104641 is an equidigital number, since it uses as much as digits as its factorization.

664104641 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13824, while the sum is 32.

The square root of 664104641 is about 25770.2278026408. The cubic root of 664104641 is about 872.4599603413.

The spelling of 664104641 in words is "six hundred sixty-four million, one hundred four thousand, six hundred forty-one".