169680557929 has 3 divisors (see below), whose sum is σ = 169680969853. Its totient is φ = 169680146006.

The previous prime is 169680557927. The next prime is 169680557953. The reversal of 169680557929 is 929755086961.

The square root of 169680557929 is 411923.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 929755086961 = 151247 ⋅6147263.

It is not a de Polignac number, because 169680557929 - 2¹ = 169680557927 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (169680557927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 205962 + ... + 617884.

Almost surely, 2^169680557929 is an apocalyptic number.

169680557929 is the 411923-rd square number.

169680557929 is the 205962-nd centered octagonal number.

It is an amenable number.

169680557929 is a deficient number, since it is larger than the sum of its proper divisors (411924).

169680557929 is an frugal number, since it uses more digits than its factorization.

169680557929 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 823846 (or 411923 counting only the distinct ones).

The product of its (nonzero) digits is 73483200, while the sum is 67.

It can be divided in two parts, 169680 and 557929, that added together give a square (727609 = 853²).

The spelling of 169680557929 in words is "one hundred sixty-nine billion, six hundred eighty million, five hundred fifty-seven thousand, nine hundred twenty-nine".