169059946561 has 9 divisors (see below), whose sum is σ = 185831193793. Its totient is φ = 153686748820.

The previous prime is 169059946543. The next prime is 169059946621. The reversal of 169059946561 is 165649950961.

The square root of 169059946561 is 411169.

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

It is not a de Polignac number, because 169059946561 - 2¹⁷ = 169059815489 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 169059946561.

It is not an unprimeable number, because it can be changed into a prime (169059946261) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 4504170 + ... + 4541548.

Almost surely, 2^169059946561 is an apocalyptic number.

169059946561 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

169059946561 is the 411169-th square number.

169059946561 is the 205585-th centered octagonal number.

It is an amenable number.

169059946561 is a deficient number, since it is larger than the sum of its proper divisors (16771247232).

169059946561 is an frugal number, since it uses more digits than its factorization.

169059946561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74780 (or 37390 counting only the distinct ones).

The product of its (nonzero) digits is 15746400, while the sum is 61.

The spelling of 169059946561 in words is "one hundred sixty-nine billion, fifty-nine million, nine hundred forty-six thousand, five hundred sixty-one".