167522561 has 4 divisors (see below), whose sum is σ = 167548500. Its totient is φ = 167496624.

The previous prime is 167522557. The next prime is 167522591. The reversal of 167522561 is 165225761.

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: 165225761 = 2267 ⋅72883.

It can be written as a sum of positive squares in 2 ways, for example, as 163840000 + 3682561 = 12800^2 + 1919^2 .

It is a cyclic number.

It is not a de Polignac number, because 167522561 - 2² = 167522557 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (167522591) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5255 + ... + 19043.

It is an arithmetic number, because the mean of its divisors is an integer number (41887125).

Almost surely, 2^167522561 is an apocalyptic number.

It is an amenable number.

167522561 is a deficient number, since it is larger than the sum of its proper divisors (25939).

167522561 is a wasteful number, since it uses less digits than its factorization.

167522561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25938.

The product of its digits is 25200, while the sum is 35.

The square root of 167522561 is about 12943.0506836681. The cubic root of 167522561 is about 551.2616337787.

The spelling of 167522561 in words is "one hundred sixty-seven million, five hundred twenty-two thousand, five hundred sixty-one".