66528541 has 4 divisors (see below), whose sum is σ = 66896284. Its totient is φ = 66160800.

The previous prime is 66528529. The next prime is 66528551. The reversal of 66528541 is 14582566.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 11249316 + 55279225 = 3354^2 + 7435^2 .

It is a cyclic number.

It is not a de Polignac number, because 66528541 - 2⁵ = 66528509 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 66528541.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66528551) 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, 183600 + ... + 183961.

It is an arithmetic number, because the mean of its divisors is an integer number (16724071).

Almost surely, 2^66528541 is an apocalyptic number.

It is an amenable number.

66528541 is a deficient number, since it is larger than the sum of its proper divisors (367743).

66528541 is a wasteful number, since it uses less digits than its factorization.

66528541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 367742.

The product of its digits is 57600, while the sum is 37.

The square root of 66528541 is about 8156.5029884136. The cubic root of 66528541 is about 405.1999033460.

The spelling of 66528541 in words is "sixty-six million, five hundred twenty-eight thousand, five hundred forty-one".