664601663 has 8 divisors (see below), whose sum is σ = 725276160. Its totient is φ = 603969880.

The previous prime is 664601657. The next prime is 664601669. The reversal of 664601663 is 366106466.

It is an interprime number because it is at equal distance from previous prime (664601657) and next prime (664601669).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 664601663 - 2¹² = 664597567 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664601669) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27956 + ... + 45942.

It is an arithmetic number, because the mean of its divisors is an integer number (90659520).

Almost surely, 2^664601663 is an apocalyptic number.

664601663 is a deficient number, since it is larger than the sum of its proper divisors (60674497).

664601663 is a wasteful number, since it uses less digits than its factorization.

664601663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21357.

The product of its (nonzero) digits is 93312, while the sum is 38.

The square root of 664601663 is about 25779.8693363640. The cubic root of 664601663 is about 872.6775584098.

The spelling of 664601663 in words is "six hundred sixty-four million, six hundred one thousand, six hundred sixty-three".