1665005749 has 8 divisors (see below), whose sum is σ = 1818484992. Its totient is φ = 1511879040.

The previous prime is 1665005747. The next prime is 1665005767. The reversal of 1665005749 is 9475005661.

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

It is a cyclic number.

It is not a de Polignac number, because 1665005749 - 2¹ = 1665005747 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1665005747) by changing a digit.

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, 78204 + ... + 97189.

It is an arithmetic number, because the mean of its divisors is an integer number (227310624).

Almost surely, 2^1665005749 is an apocalyptic number.

It is an amenable number.

1665005749 is a deficient number, since it is larger than the sum of its proper divisors (153479243).

1665005749 is a wasteful number, since it uses less digits than its factorization.

1665005749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 176267.

The product of its (nonzero) digits is 226800, while the sum is 43.

The square root of 1665005749 is about 40804.4819719599. The cubic root of 1665005749 is about 1185.2371234662.

The spelling of 1665005749 in words is "one billion, six hundred sixty-five million, five thousand, seven hundred forty-nine".