1801648665 has 24 divisors (see below), whose sum is σ = 3126771648. Its totient is φ = 959675040.

The previous prime is 1801648619. The next prime is 1801648679. The reversal of 1801648665 is 5668461081.

It is not a de Polignac number, because 1801648665 - 2⁶ = 1801648601 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 1801648665.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 11812 + ... + 61178.

It is an arithmetic number, because the mean of its divisors is an integer number (130282152).

Almost surely, 2^1801648665 is an apocalyptic number.

1801648665 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1801648665 is a deficient number, since it is larger than the sum of its proper divisors (1325122983).

1801648665 is a wasteful number, since it uses less digits than its factorization.

1801648665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50189 (or 50186 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 45.

The square root of 1801648665 is about 42445.8321275482. The cubic root of 1801648665 is about 1216.8116751749.

The spelling of 1801648665 in words is "one billion, eight hundred one million, six hundred forty-eight thousand, six hundred sixty-five".