66777803 has 2 divisors, whose sum is σ = 66777804. Its totient is φ = 66777802.

The previous prime is 66777779. The next prime is 66777811. The reversal of 66777803 is 30877766.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66777803 - 2¹⁴ = 66761419 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (66777103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33388901 + 33388902.

It is an arithmetic number, because the mean of its divisors is an integer number (33388902).

Almost surely, 2^66777803 is an apocalyptic number.

66777803 is a deficient number, since it is larger than the sum of its proper divisors (1).

66777803 is an equidigital number, since it uses as much as digits as its factorization.

66777803 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 296352, while the sum is 44.

The square root of 66777803 is about 8171.7686580079. The cubic root of 66777803 is about 405.7053258252.

The spelling of 66777803 in words is "sixty-six million, seven hundred seventy-seven thousand, eight hundred three".