1616664061 has 2 divisors, whose sum is σ = 1616664062. Its totient is φ = 1616664060.

The previous prime is 1616664053. The next prime is 1616664173. The reversal of 1616664061 is 1604666161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1583244100 + 33419961 = 39790^2 + 5781^2 .

It is a cyclic number.

It is not a de Polignac number, because 1616664061 - 2³ = 1616664053 is a prime.

It is a super-2 number, since 2×1616664061² = 5227205372258023442, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1616664061.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1616664961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 808332030 + 808332031.

It is an arithmetic number, because the mean of its divisors is an integer number (808332031).

Almost surely, 2^1616664061 is an apocalyptic number.

It is an amenable number.

1616664061 is a deficient number, since it is larger than the sum of its proper divisors (1).

1616664061 is an equidigital number, since it uses as much as digits as its factorization.

1616664061 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 31104, while the sum is 37.

The square root of 1616664061 is about 40207.7612035289. The cubic root of 1616664061 is about 1173.6535803614.

The spelling of 1616664061 in words is "one billion, six hundred sixteen million, six hundred sixty-four thousand, sixty-one".