664425525 has 24 divisors (see below), whose sum is σ = 1136400480. Its totient is φ = 342139840.

The previous prime is 664425469. The next prime is 664425529. The reversal of 664425525 is 525524466.

664425525 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 664425525 - 2¹⁶ = 664359989 is a prime.

It is a super-2 number, since 2×664425525² = 882922556543051250, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664425529) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 150567 + ... + 154916.

It is an arithmetic number, because the mean of its divisors is an integer number (47350020).

Almost surely, 2^664425525 is an apocalyptic number.

It is an amenable number.

664425525 is a deficient number, since it is larger than the sum of its proper divisors (471974955).

664425525 is a wasteful number, since it uses less digits than its factorization.

664425525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 305525 (or 305520 counting only the distinct ones).

The product of its digits is 288000, while the sum is 39.

The square root of 664425525 is about 25776.4529173430. The cubic root of 664425525 is about 872.6004569570.

The spelling of 664425525 in words is "six hundred sixty-four million, four hundred twenty-five thousand, five hundred twenty-five".