66059921 has 2 divisors, whose sum is σ = 66059922. Its totient is φ = 66059920.

The previous prime is 66059869. The next prime is 66059969. The reversal of 66059921 is 12995066.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 52635025 + 13424896 = 7255^2 + 3664^2 .

It is a cyclic number.

It is not a de Polignac number, because 66059921 - 2⁶ = 66059857 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (66059221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33029960 + 33029961.

It is an arithmetic number, because the mean of its divisors is an integer number (33029961).

Almost surely, 2^66059921 is an apocalyptic number.

It is an amenable number.

66059921 is a deficient number, since it is larger than the sum of its proper divisors (1).

66059921 is an equidigital number, since it uses as much as digits as its factorization.

66059921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 29160, while the sum is 38.

The square root of 66059921 is about 8127.7254505796. The cubic root of 66059921 is about 404.2462656463.

The spelling of 66059921 in words is "sixty-six million, fifty-nine thousand, nine hundred twenty-one".