168746553505261 has 2 divisors, whose sum is σ = 168746553505262. Its totient is φ = 168746553505260.

The previous prime is 168746553505223. The next prime is 168746553505303. The reversal of 168746553505261 is 162505355647861.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 150414403566025 + 18332149939236 = 12264355^2 + 4281606^2 .

It is a cyclic number.

It is not a de Polignac number, because 168746553505261 - 2³¹ = 168744406021613 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 168746553505193 and 168746553505202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (168746553545261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 84373276752630 + 84373276752631.

It is an arithmetic number, because the mean of its divisors is an integer number (84373276752631).

Almost surely, 2^{168746553505261} is an apocalyptic number.

It is an amenable number.

168746553505261 is a deficient number, since it is larger than the sum of its proper divisors (1).

168746553505261 is an equidigital number, since it uses as much as digits as its factorization.

168746553505261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 181440000, while the sum is 64.

The spelling of 168746553505261 in words is "one hundred sixty-eight trillion, seven hundred forty-six billion, five hundred fifty-three million, five hundred five thousand, two hundred sixty-one".