1664242471 has 16 divisors (see below), whose sum is σ = 1822233600. Its totient is φ = 1514073600.

The previous prime is 1664242469. The next prime is 1664242493. The reversal of 1664242471 is 1742424661.

It is a cyclic number.

It is not a de Polignac number, because 1664242471 - 2¹ = 1664242469 is a prime.

It is a super-3 number, since 3×1664242471³ (a number of 29 digits) contains 333 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1664242471.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1664242271) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 66375 + ... + 87943.

It is an arithmetic number, because the mean of its divisors is an integer number (113889600).

Almost surely, 2^1664242471 is an apocalyptic number.

1664242471 is a deficient number, since it is larger than the sum of its proper divisors (157991129).

1664242471 is a wasteful number, since it uses less digits than its factorization.

1664242471 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21750.

The product of its digits is 64512, while the sum is 37.

The square root of 1664242471 is about 40795.1280301950. The cubic root of 1664242471 is about 1185.0559822105.

The spelling of 1664242471 in words is "one billion, six hundred sixty-four million, two hundred forty-two thousand, four hundred seventy-one".