664043610 has 16 divisors (see below), whose sum is σ = 1593704736. Its totient is φ = 177078288.

The previous prime is 664043609. The next prime is 664043623. The reversal of 664043610 is 16340466.

It is a Harshad number since it is a multiple of its sum of digits (30), and also a Moran number because the ratio is a prime number: 22134787 = 664043610 / (6 + 6 + 4 + 0 + 4 + 3 + 6 + 1 + 0).

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11067364 + ... + 11067423.

It is an arithmetic number, because the mean of its divisors is an integer number (99606546).

Almost surely, 2^664043610 is an apocalyptic number.

664043610 is an abundant number, since it is smaller than the sum of its proper divisors (929661126).

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

664043610 is a wasteful number, since it uses less digits than its factorization.

664043610 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22134797.

The product of its (nonzero) digits is 10368, while the sum is 30.

The square root of 664043610 is about 25769.0436376673. The cubic root of 664043610 is about 872.4332332606.

The spelling of 664043610 in words is "six hundred sixty-four million, forty-three thousand, six hundred ten".