1665305001 has 14 divisors (see below), whose sum is σ = 2496816410. Its totient is φ = 1110202848.

The previous prime is 1665304999. The next prime is 1665305003. The reversal of 1665305001 is 1005035661.

It is a happy number.

1665305001 is a `hidden beast` number, since 1 + 6 + 653 + 0 + 5 + 0 + 0 + 1 = 666.

It is an interprime number because it is at equal distance from previous prime (1665304999) and next prime (1665305003).

It can be written as a sum of positive squares in only one way, i.e., 1614110976 + 51194025 = 40176^2 + 7155^2 .

It is not a de Polignac number, because 1665305001 - 2¹ = 1665304999 is a prime.

It is a super-2 number, since 2×1665305001² = 5546481492711220002, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1665305003) by changing a digit.

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 13 ways as a sum of consecutive naturals, for example, 1141456 + ... + 1142913.

Almost surely, 2^1665305001 is an apocalyptic number.

It is an amenable number.

1665305001 is a deficient number, since it is larger than the sum of its proper divisors (831511409).

1665305001 is an frugal number, since it uses more digits than its factorization.

1665305001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2284387 (or 2284372 counting only the distinct ones).

The product of its (nonzero) digits is 2700, while the sum is 27.

The square root of 1665305001 is about 40808.1487083156. The cubic root of 1665305001 is about 1185.3081268912.

The spelling of 1665305001 in words is "one billion, six hundred sixty-five million, three hundred five thousand, one".