664187611 has 2 divisors, whose sum is σ = 664187612. Its totient is φ = 664187610.

The previous prime is 664187591. The next prime is 664187633. The reversal of 664187611 is 116781466.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-664187611 is a prime.

It is a super-2 number, since 2×664187611² = 882290365211774642, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (664187651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332093805 + 332093806.

It is an arithmetic number, because the mean of its divisors is an integer number (332093806).

Almost surely, 2^664187611 is an apocalyptic number.

664187611 is a deficient number, since it is larger than the sum of its proper divisors (1).

664187611 is an equidigital number, since it uses as much as digits as its factorization.

664187611 is an evil number, because the sum of its binary digits is even.

The product of its digits is 48384, while the sum is 40.

The square root of 664187611 is about 25771.8375557507. The cubic root of 664187611 is about 872.4962924613.

The spelling of 664187611 in words is "six hundred sixty-four million, one hundred eighty-seven thousand, six hundred eleven".