66444787 has 2 divisors, whose sum is σ = 66444788. Its totient is φ = 66444786.

The previous prime is 66444779. The next prime is 66444803. The reversal of 66444787 is 78744466.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66444787 - 2³ = 66444779 is a prime.

It is not a weakly prime, because it can be changed into another prime (66444187) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33222393 + 33222394.

It is an arithmetic number, because the mean of its divisors is an integer number (33222394).

Almost surely, 2^66444787 is an apocalyptic number.

66444787 is a deficient number, since it is larger than the sum of its proper divisors (1).

66444787 is an equidigital number, since it uses as much as digits as its factorization.

66444787 is an evil number, because the sum of its binary digits is even.

The product of its digits is 903168, while the sum is 46.

The square root of 66444787 is about 8151.3671859388. The cubic root of 66444787 is about 405.0297940790.

It can be divided in two parts, 664 and 44787, that added together give a triangular number (45451 = T₃₀₁).

The spelling of 66444787 in words is "sixty-six million, four hundred forty-four thousand, seven hundred eighty-seven".