1616856161 has 2 divisors, whose sum is σ = 1616856162. Its totient is φ = 1616856160.

The previous prime is 1616856151. The next prime is 1616856193. The reversal of 1616856161 is 1616586161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1570616161 + 46240000 = 39631^2 + 6800^2 .

It is a cyclic number.

It is not a de Polignac number, because 1616856161 - 2¹⁰ = 1616855137 is a prime.

It is a super-2 number, since 2×1616856161² = 5228447690727315842, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1616856151) 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 as a sum of consecutive naturals, namely, 808428080 + 808428081.

It is an arithmetic number, because the mean of its divisors is an integer number (808428081).

Almost surely, 2^1616856161 is an apocalyptic number.

It is an amenable number.

1616856161 is a deficient number, since it is larger than the sum of its proper divisors (1).

1616856161 is an equidigital number, since it uses as much as digits as its factorization.

1616856161 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 51840, while the sum is 41.

The square root of 1616856161 is about 40210.1499748509. The cubic root of 1616856161 is about 1173.7000649566.

The spelling of 1616856161 in words is "one billion, six hundred sixteen million, eight hundred fifty-six thousand, one hundred sixty-one".