664410643 has 8 divisors (see below), whose sum is σ = 757608768. Its totient is φ = 577225344.

The previous prime is 664410641. The next prime is 664410689. The reversal of 664410643 is 346014466.

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

It is not a de Polignac number, because 664410643 - 2¹ = 664410641 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 664410599 and 664410608.

It is not an unprimeable number, because it can be changed into a prime (664410641) 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, 1502971 + ... + 1503412.

It is an arithmetic number, because the mean of its divisors is an integer number (94701096).

Almost surely, 2^664410643 is an apocalyptic number.

664410643 is a deficient number, since it is larger than the sum of its proper divisors (93198125).

664410643 is a wasteful number, since it uses less digits than its factorization.

664410643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3006413.

The product of its (nonzero) digits is 41472, while the sum is 34.

The square root of 664410643 is about 25776.1642414072. The cubic root of 664410643 is about 872.5939419871.

The spelling of 664410643 in words is "six hundred sixty-four million, four hundred ten thousand, six hundred forty-three".