1649285665 has 8 divisors (see below), whose sum is σ = 1999546920. Its totient is φ = 1305825792.

The previous prime is 1649285663. The next prime is 1649285681. The reversal of 1649285665 is 5665829461.

It can be written as a sum of positive squares in 4 ways, for example, as 198894609 + 1450391056 = 14103^2 + 38084^2 .

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 1649285665 - 2¹ = 1649285663 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1649285663) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1699810 + ... + 1700779.

It is an arithmetic number, because the mean of its divisors is an integer number (249943365).

Almost surely, 2^1649285665 is an apocalyptic number.

It is an amenable number.

1649285665 is a deficient number, since it is larger than the sum of its proper divisors (350261255).

1649285665 is an equidigital number, since it uses as much as digits as its factorization.

1649285665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3400691.

The product of its digits is 3110400, while the sum is 52.

The square root of 1649285665 is about 40611.3982152794. The cubic root of 1649285665 is about 1181.4951995491.

It can be divided in two parts, 164 and 9285665, that added together give a palindrome (9285829).

The spelling of 1649285665 in words is "one billion, six hundred forty-nine million, two hundred eighty-five thousand, six hundred sixty-five".