1666038265 has 8 divisors (see below), whose sum is σ = 1999593288. Its totient is φ = 1332599040.

The previous prime is 1666038251. The next prime is 1666038271. The reversal of 1666038265 is 5628306661.

It can be written as a sum of positive squares in 4 ways, for example, as 416486464 + 1249551801 = 20408^2 + 35349^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1666038265 - 2⁷ = 1666038137 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 (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6699 + ... + 58111.

It is an arithmetic number, because the mean of its divisors is an integer number (249949161).

Almost surely, 2^1666038265 is an apocalyptic number.

It is an amenable number.

1666038265 is a deficient number, since it is larger than the sum of its proper divisors (333555023).

1666038265 is an equidigital number, since it uses as much as digits as its factorization.

1666038265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57899.

The product of its (nonzero) digits is 311040, while the sum is 43.

The square root of 1666038265 is about 40817.1320036085. The cubic root of 1666038265 is about 1185.4820722530.

The spelling of 1666038265 in words is "one billion, six hundred sixty-six million, thirty-eight thousand, two hundred sixty-five".