664406177 has 2 divisors, whose sum is σ = 664406178. Its totient is φ = 664406176.

The previous prime is 664406159. The next prime is 664406207. The reversal of 664406177 is 771604466.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 664041361 + 364816 = 25769^2 + 604^2 .

It is a cyclic number.

It is not a de Polignac number, because 664406177 - 2²² = 660211873 is a prime.

It is not a weakly prime, because it can be changed into another prime (664406137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332203088 + 332203089.

It is an arithmetic number, because the mean of its divisors is an integer number (332203089).

Almost surely, 2^664406177 is an apocalyptic number.

It is an amenable number.

664406177 is a deficient number, since it is larger than the sum of its proper divisors (1).

664406177 is an equidigital number, since it uses as much as digits as its factorization.

664406177 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 169344, while the sum is 41.

The square root of 664406177 is about 25776.0776108391. The cubic root of 664406177 is about 872.5919868643.

The spelling of 664406177 in words is "six hundred sixty-four million, four hundred six thousand, one hundred seventy-seven".