1664412505 has 8 divisors (see below), whose sum is σ = 2282622912. Its totient is φ = 1141311408.

The previous prime is 1664412467. The next prime is 1664412517. The reversal of 1664412505 is 5052144661.

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 1664412505 - 2¹⁹ = 1663888217 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23777287 + ... + 23777356.

It is an arithmetic number, because the mean of its divisors is an integer number (285327864).

Almost surely, 2^1664412505 is an apocalyptic number.

It is an amenable number.

1664412505 is a deficient number, since it is larger than the sum of its proper divisors (618210407).

1664412505 is an equidigital number, since it uses as much as digits as its factorization.

1664412505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47554655.

The product of its (nonzero) digits is 28800, while the sum is 34.

The square root of 1664412505 is about 40797.2119758201. The cubic root of 1664412505 is about 1185.0963395002.

The spelling of 1664412505 in words is "one billion, six hundred sixty-four million, four hundred twelve thousand, five hundred five".