66670000031777 has 2 divisors, whose sum is σ = 66670000031778. Its totient is φ = 66670000031776.

The previous prime is 66670000031737. The next prime is 66670000031779. The reversal of 66670000031777 is 77713000007666.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 55749876629056 + 10920123402721 = 7466584^2 + 3304561^2 .

It is a cyclic number.

It is not a de Polignac number, because 66670000031777 - 2¹⁴ = 66670000015393 is a prime.

Together with 66670000031779, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (66670000031779) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33335000015888 + 33335000015889.

It is an arithmetic number, because the mean of its divisors is an integer number (33335000015889).

Almost surely, 2^{66670000031777} is an apocalyptic number.

It is an amenable number.

66670000031777 is a deficient number, since it is larger than the sum of its proper divisors (1).

66670000031777 is an equidigital number, since it uses as much as digits as its factorization.

66670000031777 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1555848, while the sum is 50.

The spelling of 66670000031777 in words is "sixty-six trillion, six hundred seventy billion, thirty-one thousand, seven hundred seventy-seven".