664420611 has 4 divisors (see below), whose sum is σ = 885894152. Its totient is φ = 442947072.

The previous prime is 664420597. The next prime is 664420637. The reversal of 664420611 is 116024466.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 664420611 - 2⁵ = 664420579 is a prime.

It is a super-2 number, since 2×664420611² = 882909496643226642, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (664440611) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 110736766 + ... + 110736771.

It is an arithmetic number, because the mean of its divisors is an integer number (221473538).

Almost surely, 2^664420611 is an apocalyptic number.

664420611 is a deficient number, since it is larger than the sum of its proper divisors (221473541).

664420611 is a wasteful number, since it uses less digits than its factorization.

664420611 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 221473540.

The product of its (nonzero) digits is 6912, while the sum is 30.

The square root of 664420611 is about 25776.3575976126. The cubic root of 664420611 is about 872.5983057407.

The spelling of 664420611 in words is "six hundred sixty-four million, four hundred twenty thousand, six hundred eleven".