664867037 has 2 divisors, whose sum is σ = 664867038. Its totient is φ = 664867036.

The previous prime is 664867031. The next prime is 664867061. The reversal of 664867037 is 730768466.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 432182521 + 232684516 = 20789^2 + 15254^2 .

It is a cyclic number.

It is not a de Polignac number, because 664867037 - 2¹² = 664862941 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 664866982 and 664867000.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (664867031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332433518 + 332433519.

It is an arithmetic number, because the mean of its divisors is an integer number (332433519).

Almost surely, 2^664867037 is an apocalyptic number.

It is an amenable number.

664867037 is a deficient number, since it is larger than the sum of its proper divisors (1).

664867037 is an equidigital number, since it uses as much as digits as its factorization.

664867037 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1016064, while the sum is 47.

The square root of 664867037 is about 25785.0157455837. The cubic root of 664867037 is about 872.7936957043.

The spelling of 664867037 in words is "six hundred sixty-four million, eight hundred sixty-seven thousand, thirty-seven".