66927121 has 2 divisors, whose sum is σ = 66927122. Its totient is φ = 66927120.

The previous prime is 66927097. The next prime is 66927131. The reversal of 66927121 is 12172966.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 59830225 + 7096896 = 7735^2 + 2664^2 .

It is a cyclic number.

It is not a de Polignac number, because 66927121 - 2⁵ = 66927089 is a prime.

It is not a weakly prime, because it can be changed into another prime (66927131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33463560 + 33463561.

It is an arithmetic number, because the mean of its divisors is an integer number (33463561).

Almost surely, 2^66927121 is an apocalyptic number.

It is an amenable number.

66927121 is a deficient number, since it is larger than the sum of its proper divisors (1).

66927121 is an equidigital number, since it uses as much as digits as its factorization.

66927121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9072, while the sum is 34.

The square root of 66927121 is about 8180.8997671405. The cubic root of 66927121 is about 406.0074921571.

The spelling of 66927121 in words is "sixty-six million, nine hundred twenty-seven thousand, one hundred twenty-one".