66527621 has 2 divisors, whose sum is σ = 66527622. Its totient is φ = 66527620.

The previous prime is 66527603. The next prime is 66527627. The reversal of 66527621 is 12672566.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 65448100 + 1079521 = 8090^2 + 1039^2 .

It is a cyclic number.

It is not a de Polignac number, because 66527621 - 2⁶ = 66527557 is a prime.

It is a super-3 number, since 3×66527621³ (a number of 24 digits) contains 333 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66527627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33263810 + 33263811.

It is an arithmetic number, because the mean of its divisors is an integer number (33263811).

Almost surely, 2^66527621 is an apocalyptic number.

It is an amenable number.

66527621 is a deficient number, since it is larger than the sum of its proper divisors (1).

66527621 is an equidigital number, since it uses as much as digits as its factorization.

66527621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 30240, while the sum is 35.

The square root of 66527621 is about 8156.4465915005. The cubic root of 66527621 is about 405.1980355480.

The spelling of 66527621 in words is "sixty-six million, five hundred twenty-seven thousand, six hundred twenty-one".