664967011 has 4 divisors (see below), whose sum is σ = 665022952. Its totient is φ = 664911072.

The previous prime is 664967003. The next prime is 664967029. The reversal of 664967011 is 110769466.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 664967011 - 2³ = 664967003 is a prime.

It is a super-2 number, since 2×664967011² = 884362251436548242, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (664967041) 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, 2265 + ... + 36538.

It is an arithmetic number, because the mean of its divisors is an integer number (166255738).

Almost surely, 2^664967011 is an apocalyptic number.

664967011 is a deficient number, since it is larger than the sum of its proper divisors (55941).

664967011 is a wasteful number, since it uses less digits than its factorization.

664967011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55940.

The product of its (nonzero) digits is 54432, while the sum is 40.

The square root of 664967011 is about 25786.9542792475. The cubic root of 664967011 is about 872.8374399414.

The spelling of 664967011 in words is "six hundred sixty-four million, nine hundred sixty-seven thousand, eleven".