664400425205 has 48 divisors (see below), whose sum is σ = 885252170880. Its totient is φ = 478300394880.

The previous prime is 664400425127. The next prime is 664400425217. The reversal of 664400425205 is 502524004466.

It is a de Polignac number, because none of the positive numbers 2^k-664400425205 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 76689704 + ... + 76698366.

It is an arithmetic number, because the mean of its divisors is an integer number (18442753560).

Almost surely, 2^664400425205 is an apocalyptic number.

It is an amenable number.

664400425205 is a deficient number, since it is larger than the sum of its proper divisors (220851745675).

664400425205 is a wasteful number, since it uses less digits than its factorization.

664400425205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9962 (or 9951 counting only the distinct ones).

The product of its (nonzero) digits is 230400, while the sum is 38.

The spelling of 664400425205 in words is "six hundred sixty-four billion, four hundred million, four hundred twenty-five thousand, two hundred five".