169680544157669 has 2 divisors, whose sum is σ = 169680544157670. Its totient is φ = 169680544157668.

The previous prime is 169680544157629. The next prime is 169680544157689. The reversal of 169680544157669 is 966751445086961.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 144585834628225 + 25094709529444 = 12024385^2 + 5009462^2 .

It is a cyclic number.

It is not a de Polignac number, because 169680544157669 - 2³² = 169676249190373 is a prime.

It is a super-2 number, since 2×169680544157669² (a number of 29 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 169680544157669.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (169680544157609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 84840272078834 + 84840272078835.

It is an arithmetic number, because the mean of its divisors is an integer number (84840272078835).

Almost surely, 2^{169680544157669} is an apocalyptic number.

It is an amenable number.

169680544157669 is a deficient number, since it is larger than the sum of its proper divisors (1).

169680544157669 is an equidigital number, since it uses as much as digits as its factorization.

169680544157669 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2351462400, while the sum is 77.

The spelling of 169680544157669 in words is "one hundred sixty-nine trillion, six hundred eighty billion, five hundred forty-four million, one hundred fifty-seven thousand, six hundred sixty-nine".