1649165599 has 8 divisors (see below), whose sum is σ = 1656047520. Its totient is φ = 1642298976.

The previous prime is 1649165593. The next prime is 1649165611. The reversal of 1649165599 is 9955619461.

It is a happy number.

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 1649165599 - 2¹³ = 1649157407 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 (1649165593) 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, 244557 + ... + 251209.

It is an arithmetic number, because the mean of its divisors is an integer number (207005940).

Almost surely, 2^1649165599 is an apocalyptic number.

1649165599 is a deficient number, since it is larger than the sum of its proper divisors (6881921).

1649165599 is an equidigital number, since it uses as much as digits as its factorization.

1649165599 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7649.

The product of its digits is 2624400, while the sum is 55.

The square root of 1649165599 is about 40609.9199580595. The cubic root of 1649165599 is about 1181.4665283799.

The spelling of 1649165599 in words is "one billion, six hundred forty-nine million, one hundred sixty-five thousand, five hundred ninety-nine".