1665051663 has 16 divisors (see below), whose sum is σ = 2422598400. Its totient is φ = 1008828480.

The previous prime is 1665051659. The next prime is 1665051667. The reversal of 1665051663 is 3661505661.

It is an interprime number because it is at equal distance from previous prime (1665051659) and next prime (1665051667).

It is not a de Polignac number, because 1665051663 - 2² = 1665051659 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1665051667) 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 15 ways as a sum of consecutive naturals, for example, 176203 + ... + 185411.

It is an arithmetic number, because the mean of its divisors is an integer number (151412400).

Almost surely, 2^1665051663 is an apocalyptic number.

1665051663 is a deficient number, since it is larger than the sum of its proper divisors (757546737).

1665051663 is a wasteful number, since it uses less digits than its factorization.

1665051663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14702.

The product of its (nonzero) digits is 97200, while the sum is 39.

The square root of 1665051663 is about 40805.0445778460. The cubic root of 1665051663 is about 1185.2480180185.

The spelling of 1665051663 in words is "one billion, six hundred sixty-five million, fifty-one thousand, six hundred sixty-three".