1616616553549 has 2 divisors, whose sum is σ = 1616616553550. Its totient is φ = 1616616553548.

The previous prime is 1616616553499. The next prime is 1616616553561. The reversal of 1616616553549 is 9453556166161.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1611503302500 + 5113251049 = 1269450^2 + 71507^2 .

It is an emirp because it is prime and its reverse (9453556166161) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1616616553549 - 2²¹ = 1616614456397 is a prime.

It is a super-2 number, since 2×1616616553549² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1616616553493 and 1616616553502.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1616616553949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 808308276774 + 808308276775.

It is an arithmetic number, because the mean of its divisors is an integer number (808308276775).

Almost surely, 2^{1616616553549} is an apocalyptic number.

It is an amenable number.

1616616553549 is a deficient number, since it is larger than the sum of its proper divisors (1).

1616616553549 is an equidigital number, since it uses as much as digits as its factorization.

1616616553549 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17496000, while the sum is 58.

The spelling of 1616616553549 in words is "one trillion, six hundred sixteen billion, six hundred sixteen million, five hundred fifty-three thousand, five hundred forty-nine".