1664037986 has 16 divisors (see below), whose sum is σ = 2704559424. Its totient is φ = 763303824.

The previous prime is 1664037983. The next prime is 1664037989. The reversal of 1664037986 is 6897304661.

It is an interprime number because it is at equal distance from previous prime (1664037983) and next prime (1664037989).

It is not an unprimeable number, because it can be changed into a prime (1664037983) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 192086 + ... + 200561.

It is an arithmetic number, because the mean of its divisors is an integer number (169034964).

Almost surely, 2^1664037986 is an apocalyptic number.

1664037986 is a deficient number, since it is larger than the sum of its proper divisors (1040521438).

1664037986 is a wasteful number, since it uses less digits than its factorization.

1664037986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 392825.

The product of its (nonzero) digits is 1306368, while the sum is 50.

The square root of 1664037986 is about 40792.6217103044. The cubic root of 1664037986 is about 1185.0074443917.

The spelling of 1664037986 in words is "one billion, six hundred sixty-four million, thirty-seven thousand, nine hundred eighty-six".