664939250652 has 48 divisors (see below), whose sum is σ = 1554872415264. Its totient is φ = 221168640000.

The previous prime is 664939250617. The next prime is 664939250681. The reversal of 664939250652 is 256052939466.

It is a junction number, because it is equal to n+sod(n) for n = 664939250592 and 664939250601.

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 15 ways as a sum of consecutive naturals, for example, 12672952 + ... + 12725312.

It is an arithmetic number, because the mean of its divisors is an integer number (32393175318).

Almost surely, 2^664939250652 is an apocalyptic number.

It is an amenable number.

664939250652 is an abundant number, since it is smaller than the sum of its proper divisors (889933164612).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

664939250652 is a wasteful number, since it uses less digits than its factorization.

664939250652 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54630 (or 54628 counting only the distinct ones).

The product of its (nonzero) digits is 20995200, while the sum is 57.

The spelling of 664939250652 in words is "six hundred sixty-four billion, nine hundred thirty-nine million, two hundred fifty thousand, six hundred fifty-two".