664738611 has 16 divisors (see below), whose sum is σ = 918586368. Its totient is φ = 427140000.

The previous prime is 664738537. The next prime is 664738631. The reversal of 664738611 is 116837466.

It is not a de Polignac number, because 664738611 - 2⁷ = 664738483 is a prime.

It is not an unprimeable number, because it can be changed into a prime (664738631) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9105 + ... + 37581.

It is an arithmetic number, because the mean of its divisors is an integer number (57411648).

Almost surely, 2^664738611 is an apocalyptic number.

664738611 is a deficient number, since it is larger than the sum of its proper divisors (253847757).

664738611 is a wasteful number, since it uses less digits than its factorization.

664738611 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28762.

The product of its digits is 145152, while the sum is 42.

The square root of 664738611 is about 25782.5253030032. The cubic root of 664738611 is about 872.7374956850.

The spelling of 664738611 in words is "six hundred sixty-four million, seven hundred thirty-eight thousand, six hundred eleven".