164715561 has 12 divisors (see below), whose sum is σ = 238063540. Its totient is φ = 109745280.

The previous prime is 164715559. The next prime is 164715583. The reversal of 164715561 is 165517461.

It is a happy number.

164715561 is a `hidden beast` number, since 1 + 647 + 1 + 5 + 5 + 6 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 77105961 + 87609600 = 8781^2 + 9360^2 .

It is not a de Polignac number, because 164715561 - 2¹ = 164715559 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (164715961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14421 + ... + 23181.

Almost surely, 2^164715561 is an apocalyptic number.

It is an amenable number.

164715561 is a deficient number, since it is larger than the sum of its proper divisors (73347979).

164715561 is a wasteful number, since it uses less digits than its factorization.

164715561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10856 (or 10853 counting only the distinct ones).

The product of its digits is 25200, while the sum is 36.

The square root of 164715561 is about 12834.1560299071. The cubic root of 164715561 is about 548.1653036841.

The spelling of 164715561 in words is "one hundred sixty-four million, seven hundred fifteen thousand, five hundred sixty-one".