66472510777 has 2 divisors, whose sum is σ = 66472510778. Its totient is φ = 66472510776.

The previous prime is 66472510763. The next prime is 66472510787. The reversal of 66472510777 is 77701527466.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 62162456976 + 4310053801 = 249324^2 + 65651^2 .

It is a cyclic number.

It is not a de Polignac number, because 66472510777 - 2¹⁹ = 66471986489 is a prime.

It is a super-2 number, since 2×66472510777² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (66472510787) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33236255388 + 33236255389.

It is an arithmetic number, because the mean of its divisors is an integer number (33236255389).

Almost surely, 2^66472510777 is an apocalyptic number.

It is an amenable number.

66472510777 is a deficient number, since it is larger than the sum of its proper divisors (1).

66472510777 is an equidigital number, since it uses as much as digits as its factorization.

66472510777 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3457440, while the sum is 52.

The spelling of 66472510777 in words is "sixty-six billion, four hundred seventy-two million, five hundred ten thousand, seven hundred seventy-seven".