2161641544597 has 2 divisors, whose sum is σ = 2161641544598. Its totient is φ = 2161641544596.

The previous prime is 2161641544591. The next prime is 2161641544637. The reversal of 2161641544597 is 7954451461612.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2161529205796 + 112338801 = 1470214^2 + 10599^2 .

It is a cyclic number.

It is not a de Polignac number, because 2161641544597 - 2¹⁹ = 2161641020309 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2161641544591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1080820772298 + 1080820772299.

It is an arithmetic number, because the mean of its divisors is an integer number (1080820772299).

Almost surely, 2^{2161641544597} is an apocalyptic number.

It is an amenable number.

2161641544597 is a deficient number, since it is larger than the sum of its proper divisors (1).

2161641544597 is an equidigital number, since it uses as much as digits as its factorization.

2161641544597 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7257600, while the sum is 55.

The spelling of 2161641544597 in words is "two trillion, one hundred sixty-one billion, six hundred forty-one million, five hundred forty-four thousand, five hundred ninety-seven".