664610245 has 24 divisors (see below), whose sum is σ = 867718656. Its totient is φ = 488449728.

The previous prime is 664610237. The next prime is 664610251. The reversal of 664610245 is 542016466.

It is not a de Polignac number, because 664610245 - 2³ = 664610237 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 664610245.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 186672 + ... + 190198.

It is an arithmetic number, because the mean of its divisors is an integer number (36154944).

Almost surely, 2^664610245 is an apocalyptic number.

664610245 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

664610245 is a deficient number, since it is larger than the sum of its proper divisors (203108411).

664610245 is a wasteful number, since it uses less digits than its factorization.

664610245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3781 (or 3768 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 34.

The square root of 664610245 is about 25780.0357835283. The cubic root of 664610245 is about 872.6813146881.

The spelling of 664610245 in words is "six hundred sixty-four million, six hundred ten thousand, two hundred forty-five".