664440037 has 2 divisors, whose sum is σ = 664440038. Its totient is φ = 664440036.

The previous prime is 664439989. The next prime is 664440041. The reversal of 664440037 is 730044466.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 378458116 + 285981921 = 19454^2 + 16911^2 .

It is a cyclic number.

It is not a de Polignac number, because 664440037 - 2¹¹ = 664437989 is a prime.

It is a super-2 number, since 2×664440037² = 882961125537122738, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 664439984 and 664440011.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (664440047) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332220018 + 332220019.

It is an arithmetic number, because the mean of its divisors is an integer number (332220019).

Almost surely, 2^664440037 is an apocalyptic number.

It is an amenable number.

664440037 is a deficient number, since it is larger than the sum of its proper divisors (1).

664440037 is an equidigital number, since it uses as much as digits as its factorization.

664440037 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48384, while the sum is 34.

The square root of 664440037 is about 25776.7344130322. The cubic root of 664440037 is about 872.6068098565.

The spelling of 664440037 in words is "six hundred sixty-four million, four hundred forty thousand, thirty-seven".