164516521 has 4 divisors (see below), whose sum is σ = 177171652. Its totient is φ = 151861392.

The previous prime is 164516509. The next prime is 164516533. The reversal of 164516521 is 125615461.

164516521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 125615461 = 163 ⋅770647.

It is an interprime number because it is at equal distance from previous prime (164516509) and next prime (164516533).

It can be written as a sum of positive squares in 2 ways, for example, as 53509225 + 111007296 = 7315^2 + 10536^2 .

It is a cyclic number.

It is not a de Polignac number, because 164516521 - 2¹¹ = 164514473 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (164516551) 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, 6327546 + ... + 6327571.

It is an arithmetic number, because the mean of its divisors is an integer number (44292913).

Almost surely, 2^164516521 is an apocalyptic number.

It is an amenable number.

164516521 is a deficient number, since it is larger than the sum of its proper divisors (12655131).

164516521 is a wasteful number, since it uses less digits than its factorization.

164516521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12655130.

The product of its digits is 7200, while the sum is 31.

The square root of 164516521 is about 12826.3993778457. The cubic root of 164516521 is about 547.9444162370.

The spelling of 164516521 in words is "one hundred sixty-four million, five hundred sixteen thousand, five hundred twenty-one".