664078201 has 2 divisors, whose sum is σ = 664078202. Its totient is φ = 664078200.

The previous prime is 664078133. The next prime is 664078211. The reversal of 664078201 is 102870466.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 493906176 + 170172025 = 22224^2 + 13045^2 .

It is a cyclic number.

It is not a de Polignac number, because 664078201 - 2²¹ = 661981049 is a prime.

It is not a weakly prime, because it can be changed into another prime (664078211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332039100 + 332039101.

It is an arithmetic number, because the mean of its divisors is an integer number (332039101).

Almost surely, 2^664078201 is an apocalyptic number.

It is an amenable number.

664078201 is a deficient number, since it is larger than the sum of its proper divisors (1).

664078201 is an equidigital number, since it uses as much as digits as its factorization.

664078201 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16128, while the sum is 34.

The square root of 664078201 is about 25769.7148024576. The cubic root of 664078201 is about 872.4483817707.

The spelling of 664078201 in words is "six hundred sixty-four million, seventy-eight thousand, two hundred one".