1616646309 has 4 divisors (see below), whose sum is σ = 2155528416. Its totient is φ = 1077764204.

The previous prime is 1616646289. The next prime is 1616646313. The reversal of 1616646309 is 9036466161.

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 a cyclic number.

It is not a de Polignac number, because 1616646309 - 2⁷ = 1616646181 is a prime.

It is a super-2 number, since 2×1616646309² = 5227090576806646962, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1616646319) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 269441049 + ... + 269441054.

It is an arithmetic number, because the mean of its divisors is an integer number (538882104).

Almost surely, 2^1616646309 is an apocalyptic number.

It is an amenable number.

1616646309 is a deficient number, since it is larger than the sum of its proper divisors (538882107).

1616646309 is an equidigital number, since it uses as much as digits as its factorization.

1616646309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 538882106.

The product of its (nonzero) digits is 139968, while the sum is 42.

The square root of 1616646309 is about 40207.5404495226. The cubic root of 1616646309 is about 1173.6492845246.

The spelling of 1616646309 in words is "one billion, six hundred sixteen million, six hundred forty-six thousand, three hundred nine".