1664871499 has 8 divisors (see below), whose sum is σ = 1738851120. Its totient is φ = 1592417376.

The previous prime is 1664871497. The next prime is 1664871521. The reversal of 1664871499 is 9941784661.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1664871499 - 2¹ = 1664871497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1664871493) 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, 379144 + ... + 383509.

It is an arithmetic number, because the mean of its divisors is an integer number (217356390).

Almost surely, 2^1664871499 is an apocalyptic number.

1664871499 is a deficient number, since it is larger than the sum of its proper divisors (73979621).

1664871499 is an equidigital number, since it uses as much as digits as its factorization.

1664871499 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 762749.

The product of its digits is 2612736, while the sum is 55.

The square root of 1664871499 is about 40802.8368989216. The cubic root of 1664871499 is about 1185.2052672477.

The spelling of 1664871499 in words is "one billion, six hundred sixty-four million, eight hundred seventy-one thousand, four hundred ninety-nine".