1664664607 has 2 divisors, whose sum is σ = 1664664608. Its totient is φ = 1664664606.

The previous prime is 1664664593. The next prime is 1664664637. The reversal of 1664664607 is 7064664661.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1664664607 is a prime.

It is a super-2 number, since 2×1664664607² = 5542216507596928898, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1664664637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 832332303 + 832332304.

It is an arithmetic number, because the mean of its divisors is an integer number (832332304).

Almost surely, 2^1664664607 is an apocalyptic number.

1664664607 is a deficient number, since it is larger than the sum of its proper divisors (1).

1664664607 is an equidigital number, since it uses as much as digits as its factorization.

1664664607 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 870912, while the sum is 46.

The square root of 1664664607 is about 40800.3015552581. The cubic root of 1664664607 is about 1185.1561704363.

The spelling of 1664664607 in words is "one billion, six hundred sixty-four million, six hundred sixty-four thousand, six hundred seven".