1664817214 has 4 divisors (see below), whose sum is σ = 2497225824. Its totient is φ = 832408606.

The previous prime is 1664817169. The next prime is 1664817313. The reversal of 1664817214 is 4127184661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 4127184661 = 2557 ⋅1614073.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 416204302 + ... + 416204305.

It is an arithmetic number, because the mean of its divisors is an integer number (624306456).

Almost surely, 2^1664817214 is an apocalyptic number.

1664817214 is a deficient number, since it is larger than the sum of its proper divisors (832408610).

1664817214 is an equidigital number, since it uses as much as digits as its factorization.

1664817214 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 832408609.

The product of its digits is 64512, while the sum is 40.

The square root of 1664817214 is about 40802.1716823995. The cubic root of 1664817214 is about 1185.1923854593.

The spelling of 1664817214 in words is "one billion, six hundred sixty-four million, eight hundred seventeen thousand, two hundred fourteen".