664866025385 has 16 divisors (see below), whose sum is σ = 836011307520. Its totient is φ = 506638292160.

The previous prime is 664866025367. The next prime is 664866025423. The reversal of 664866025385 is 583520668466.

It is not a de Polignac number, because 664866025385 - 2⁶ = 664866025321 is a prime.

It is a super-2 number, since 2×664866025385² (a number of 24 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12067586 + ... + 12122555.

It is an arithmetic number, because the mean of its divisors is an integer number (52250706720).

Almost surely, 2^664866025385 is an apocalyptic number.

It is an amenable number.

664866025385 is a deficient number, since it is larger than the sum of its proper divisors (171145282135).

664866025385 is a wasteful number, since it uses less digits than its factorization.

664866025385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24190408.

The product of its (nonzero) digits is 49766400, while the sum is 59.

The spelling of 664866025385 in words is "six hundred sixty-four billion, eight hundred sixty-six million, twenty-five thousand, three hundred eighty-five".