13258216857661 has 2 divisors, whose sum is σ = 13258216857662. Its totient is φ = 13258216857660.

The previous prime is 13258216857559. The next prime is 13258216857737. The reversal of 13258216857661 is 16675861285231.

13258216857661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7652360364100 + 5605856493561 = 2766290^2 + 2367669^2 .

It is a cyclic number.

It is not a de Polignac number, because 13258216857661 - 2³¹ = 13256069374013 is a prime.

It is a super-2 number, since 2×13258216857661² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 13258216857661.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13258216857961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6629108428830 + 6629108428831.

It is an arithmetic number, because the mean of its divisors is an integer number (6629108428831).

Almost surely, 2^{13258216857661} is an apocalyptic number.

It is an amenable number.

13258216857661 is a deficient number, since it is larger than the sum of its proper divisors (1).

13258216857661 is an equidigital number, since it uses as much as digits as its factorization.

13258216857661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 29030400, while the sum is 61.

The spelling of 13258216857661 in words is "thirteen trillion, two hundred fifty-eight billion, two hundred sixteen million, eight hundred fifty-seven thousand, six hundred sixty-one".