664125403 has 2 divisors, whose sum is σ = 664125404. Its totient is φ = 664125402.

The previous prime is 664125401. The next prime is 664125479. The reversal of 664125403 is 304521466.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 664125403 - 2¹ = 664125401 is a prime.

Together with 664125401, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (664125401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332062701 + 332062702.

It is an arithmetic number, because the mean of its divisors is an integer number (332062702).

Almost surely, 2^664125403 is an apocalyptic number.

664125403 is a deficient number, since it is larger than the sum of its proper divisors (1).

664125403 is an equidigital number, since it uses as much as digits as its factorization.

664125403 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17280, while the sum is 31.

The square root of 664125403 is about 25770.6306286827. The cubic root of 664125403 is about 872.4690521941.

Adding to 664125403 its reverse (304521466), we get a palindrome (968646869).

The spelling of 664125403 in words is "six hundred sixty-four million, one hundred twenty-five thousand, four hundred three".