1616551965593 has 2 divisors, whose sum is σ = 1616551965594. Its totient is φ = 1616551965592.

The previous prime is 1616551965527. The next prime is 1616551965629. The reversal of 1616551965593 is 3955691556161.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1062521839369 + 554030126224 = 1030787^2 + 744332^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1616551965593 is a prime.

It is a super-2 number, since 2×1616551965593² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1616551967593) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 808275982796 + 808275982797.

It is an arithmetic number, because the mean of its divisors is an integer number (808275982797).

Almost surely, 2^{1616551965593} is an apocalyptic number.

It is an amenable number.

1616551965593 is a deficient number, since it is larger than the sum of its proper divisors (1).

1616551965593 is an equidigital number, since it uses as much as digits as its factorization.

1616551965593 is an evil number, because the sum of its binary digits is even.

The product of its digits is 32805000, while the sum is 62.

The spelling of 1616551965593 in words is "one trillion, six hundred sixteen billion, five hundred fifty-one million, nine hundred sixty-five thousand, five hundred ninety-three".