1616566537 has 2 divisors, whose sum is σ = 1616566538. Its totient is φ = 1616566536.

The previous prime is 1616566507. The next prime is 1616566559. The reversal of 1616566537 is 7356656161.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1237913856 + 378652681 = 35184^2 + 19459^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1616566537 is a prime.

It is a super-2 number, since 2×1616566537² = 5226574737096344738, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1616566507) 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, 808283268 + 808283269.

It is an arithmetic number, because the mean of its divisors is an integer number (808283269).

Almost surely, 2^1616566537 is an apocalyptic number.

It is an amenable number.

1616566537 is a deficient number, since it is larger than the sum of its proper divisors (1).

1616566537 is an equidigital number, since it uses as much as digits as its factorization.

1616566537 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 680400, while the sum is 46.

The square root of 1616566537 is about 40206.5484343036. The cubic root of 1616566537 is about 1173.6299799742.

The spelling of 1616566537 in words is "one billion, six hundred sixteen million, five hundred sixty-six thousand, five hundred thirty-seven".