664164187 has 2 divisors, whose sum is σ = 664164188. Its totient is φ = 664164186.

The previous prime is 664164113. The next prime is 664164199. The reversal of 664164187 is 781461466.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 664164187 - 2¹¹ = 664162139 is a prime.

It is a super-2 number, since 2×664164187² = 882228134586741938, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (664164287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332082093 + 332082094.

It is an arithmetic number, because the mean of its divisors is an integer number (332082094).

Almost surely, 2^664164187 is an apocalyptic number.

664164187 is a deficient number, since it is larger than the sum of its proper divisors (1).

664164187 is an equidigital number, since it uses as much as digits as its factorization.

664164187 is an evil number, because the sum of its binary digits is even.

The product of its digits is 193536, while the sum is 43.

The square root of 664164187 is about 25771.3831021930. The cubic root of 664164187 is about 872.4860355233.

The spelling of 664164187 in words is "six hundred sixty-four million, one hundred sixty-four thousand, one hundred eighty-seven".