1656366609 has 4 divisors (see below), whose sum is σ = 2208488816. Its totient is φ = 1104244404.

The previous prime is 1656366599. The next prime is 1656366623. The reversal of 1656366609 is 9066636561.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 1656366609 - 2⁵ = 1656366577 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1656366209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 276061099 + ... + 276061104.

It is an arithmetic number, because the mean of its divisors is an integer number (552122204).

Almost surely, 2^1656366609 is an apocalyptic number.

It is an amenable number.

1656366609 is a deficient number, since it is larger than the sum of its proper divisors (552122207).

1656366609 is an equidigital number, since it uses as much as digits as its factorization.

1656366609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 552122206.

The product of its (nonzero) digits is 1049760, while the sum is 48.

The square root of 1656366609 is about 40698.4841118192. The cubic root of 1656366609 is about 1183.1836390068.

The spelling of 1656366609 in words is "one billion, six hundred fifty-six million, three hundred sixty-six thousand, six hundred nine".