66927697 has 2 divisors, whose sum is σ = 66927698. Its totient is φ = 66927696.

The previous prime is 66927673. The next prime is 66927701. The reversal of 66927697 is 79672966.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 45481536 + 21446161 = 6744^2 + 4631^2 .

It is a cyclic number.

It is not a de Polignac number, because 66927697 - 2⁷ = 66927569 is a prime.

It is not a weakly prime, because it can be changed into another prime (66927607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33463848 + 33463849.

It is an arithmetic number, because the mean of its divisors is an integer number (33463849).

Almost surely, 2^66927697 is an apocalyptic number.

It is an amenable number.

66927697 is a deficient number, since it is larger than the sum of its proper divisors (1).

66927697 is an equidigital number, since it uses as much as digits as its factorization.

66927697 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1714608, while the sum is 52.

The square root of 66927697 is about 8180.9349710165. The cubic root of 66927697 is about 406.0086569049.

The spelling of 66927697 in words is "sixty-six million, nine hundred twenty-seven thousand, six hundred ninety-seven".