1611656515193 has 2 divisors, whose sum is σ = 1611656515194. Its totient is φ = 1611656515192.

The previous prime is 1611656515087. The next prime is 1611656515207. The reversal of 1611656515193 is 3915156561161.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1597574658304 + 14081856889 = 1263952^2 + 118667^2 .

It is an emirp because it is prime and its reverse (3915156561161) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1611656515193 - 2²⁸ = 1611388079737 is a prime.

It is not a weakly prime, because it can be changed into another prime (1611656511193) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 805828257596 + 805828257597.

It is an arithmetic number, because the mean of its divisors is an integer number (805828257597).

Almost surely, 2^{1611656515193} is an apocalyptic number.

It is an amenable number.

1611656515193 is a deficient number, since it is larger than the sum of its proper divisors (1).

1611656515193 is an equidigital number, since it uses as much as digits as its factorization.

1611656515193 is an evil number, because the sum of its binary digits is even.

The product of its digits is 729000, while the sum is 50.

The spelling of 1611656515193 in words is "one trillion, six hundred eleven billion, six hundred fifty-six million, five hundred fifteen thousand, one hundred ninety-three".