1665020701 has 4 divisors (see below), whose sum is σ = 1705631004. Its totient is φ = 1624410400.

The previous prime is 1665020699. The next prime is 1665020729. The reversal of 1665020701 is 1070205661.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 465437476 + 1199583225 = 21574^2 + 34635^2 .

It is a cyclic number.

It is not a de Polignac number, because 1665020701 - 2¹ = 1665020699 is a prime.

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 1665020701.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1665030701) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 20305090 + ... + 20305171.

It is an arithmetic number, because the mean of its divisors is an integer number (426407751).

Almost surely, 2^1665020701 is an apocalyptic number.

It is an amenable number.

1665020701 is a deficient number, since it is larger than the sum of its proper divisors (40610303).

1665020701 is an equidigital number, since it uses as much as digits as its factorization.

1665020701 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40610302.

The product of its (nonzero) digits is 2520, while the sum is 28.

The square root of 1665020701 is about 40804.6651867161. The cubic root of 1665020701 is about 1185.2406713243.

The spelling of 1665020701 in words is "one billion, six hundred sixty-five million, twenty thousand, seven hundred one".