664818087525 has 48 divisors (see below), whose sum is σ = 1168117878528. Its totient is φ = 332481024000.

The previous prime is 664818087509. The next prime is 664818087539. The reversal of 664818087525 is 525780818466.

It is not a de Polignac number, because 664818087525 - 2⁴ = 664818087509 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 616516 + ... + 1307565.

It is an arithmetic number, because the mean of its divisors is an integer number (24335789136).

Almost surely, 2^664818087525 is an apocalyptic number.

It is an amenable number.

664818087525 is a deficient number, since it is larger than the sum of its proper divisors (503299791003).

664818087525 is a wasteful number, since it uses less digits than its factorization.

664818087525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1924382 (or 1924377 counting only the distinct ones).

The product of its (nonzero) digits is 25804800, while the sum is 60.

The spelling of 664818087525 in words is "six hundred sixty-four billion, eight hundred eighteen million, eighty-seven thousand, five hundred twenty-five".