1665447264 has 192 divisors, whose sum is σ = 5412657600. Its totient is φ = 494678016.

The previous prime is 1665447257. The next prime is 1665447271. The reversal of 1665447264 is 4627445661.

It is an interprime number because it is at equal distance from previous prime (1665447257) and next prime (1665447271).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 323172 + ... + 328284.

It is an arithmetic number, because the mean of its divisors is an integer number (28190925).

Almost surely, 2^1665447264 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1665447264, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2706328800).

1665447264 is an abundant number, since it is smaller than the sum of its proper divisors (3747210336).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1665447264 is a wasteful number, since it uses less digits than its factorization.

1665447264 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5174 (or 5160 counting only the distinct ones).

The product of its digits is 967680, while the sum is 45.

The square root of 1665447264 is about 40809.8917420765. The cubic root of 1665447264 is about 1185.3418786040.

The spelling of 1665447264 in words is "one billion, six hundred sixty-five million, four hundred forty-seven thousand, two hundred sixty-four".