664747611 has 8 divisors (see below), whose sum is σ = 966905664. Its totient is φ = 402877320.

The previous prime is 664747609. The next prime is 664747619. The reversal of 664747611 is 116747466.

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

It is not a de Polignac number, because 664747611 - 2¹ = 664747609 is a prime.

It is not an unprimeable number, because it can be changed into a prime (664747619) 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, 10071901 + ... + 10071966.

It is an arithmetic number, because the mean of its divisors is an integer number (120863208).

Almost surely, 2^664747611 is an apocalyptic number.

664747611 is a deficient number, since it is larger than the sum of its proper divisors (302158053).

664747611 is a wasteful number, since it uses less digits than its factorization.

664747611 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20143881.

The product of its digits is 169344, while the sum is 42.

The square root of 664747611 is about 25782.6998392333. The cubic root of 664747611 is about 872.7414343770.

The spelling of 664747611 in words is "six hundred sixty-four million, seven hundred forty-seven thousand, six hundred eleven".