1648655509 has 8 divisors (see below), whose sum is σ = 1705400480. Its totient is φ = 1592552016.

The previous prime is 1648655497. The next prime is 1648655527. The reversal of 1648655509 is 9055568461.

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 1648655509 - 2¹⁵ = 1648622741 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 (1648655209) 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, 155139 + ... + 165424.

It is an arithmetic number, because the mean of its divisors is an integer number (213175060).

Almost surely, 2^1648655509 is an apocalyptic number.

It is an amenable number.

1648655509 is a deficient number, since it is larger than the sum of its proper divisors (56744971).

1648655509 is a wasteful number, since it uses less digits than its factorization.

1648655509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 320739.

The product of its (nonzero) digits is 1296000, while the sum is 49.

The square root of 1648655509 is about 40603.6391103064. The cubic root of 1648655509 is about 1181.3447058844.

The spelling of 1648655509 in words is "one billion, six hundred forty-eight million, six hundred fifty-five thousand, five hundred nine".