66780803 has 2 divisors, whose sum is σ = 66780804. Its totient is φ = 66780802.

The previous prime is 66780793. The next prime is 66780817. The reversal of 66780803 is 30808766.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66780803 - 2⁶ = 66780739 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (66780503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33390401 + 33390402.

It is an arithmetic number, because the mean of its divisors is an integer number (33390402).

Almost surely, 2^66780803 is an apocalyptic number.

66780803 is a deficient number, since it is larger than the sum of its proper divisors (1).

66780803 is an equidigital number, since it uses as much as digits as its factorization.

66780803 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48384, while the sum is 38.

The square root of 66780803 is about 8171.9522147404. The cubic root of 66780803 is about 405.7114011860.

The spelling of 66780803 in words is "sixty-six million, seven hundred eighty thousand, eight hundred three".