6666540224777 has 2 divisors, whose sum is σ = 6666540224778. Its totient is φ = 6666540224776.

The previous prime is 6666540224689. The next prime is 6666540224791. The reversal of 6666540224777 is 7774220456666.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6258147653641 + 408392571136 = 2501629^2 + 639056^2 .

It is a cyclic number.

It is not a de Polignac number, because 6666540224777 - 2¹⁶ = 6666540159241 is a prime.

It is not a weakly prime, because it can be changed into another prime (6666540224177) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3333270112388 + 3333270112389.

It is an arithmetic number, because the mean of its divisors is an integer number (3333270112389).

Almost surely, 2^{6666540224777} is an apocalyptic number.

It is an amenable number.

6666540224777 is a deficient number, since it is larger than the sum of its proper divisors (1).

6666540224777 is an equidigital number, since it uses as much as digits as its factorization.

6666540224777 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 142248960, while the sum is 62.

The spelling of 6666540224777 in words is "six trillion, six hundred sixty-six billion, five hundred forty million, two hundred twenty-four thousand, seven hundred seventy-seven".