66204977 has 2 divisors, whose sum is σ = 66204978. Its totient is φ = 66204976.

The previous prime is 66204961. The next prime is 66204989. The reversal of 66204977 is 77940266.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 53129521 + 13075456 = 7289^2 + 3616^2 .

It is a cyclic number.

It is not a de Polignac number, because 66204977 - 2⁴ = 66204961 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (66204917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33102488 + 33102489.

It is an arithmetic number, because the mean of its divisors is an integer number (33102489).

Almost surely, 2^66204977 is an apocalyptic number.

It is an amenable number.

66204977 is a deficient number, since it is larger than the sum of its proper divisors (1).

66204977 is an equidigital number, since it uses as much as digits as its factorization.

66204977 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 127008, while the sum is 41.

The square root of 66204977 is about 8136.6440870914. The cubic root of 66204977 is about 404.5419339722.

The spelling of 66204977 in words is "sixty-six million, two hundred four thousand, nine hundred seventy-seven".