66673787 has 2 divisors, whose sum is σ = 66673788. Its totient is φ = 66673786.

The previous prime is 66673781. The next prime is 66673801. The reversal of 66673787 is 78737666.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66673787 - 2⁶ = 66673723 is a prime.

It is not a weakly prime, because it can be changed into another prime (66673781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33336893 + 33336894.

It is an arithmetic number, because the mean of its divisors is an integer number (33336894).

Almost surely, 2^66673787 is an apocalyptic number.

66673787 is a deficient number, since it is larger than the sum of its proper divisors (1).

66673787 is an equidigital number, since it uses as much as digits as its factorization.

66673787 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1778112, while the sum is 50.

The square root of 66673787 is about 8165.4018272220. The cubic root of 66673787 is about 405.4945682929.

The spelling of 66673787 in words is "sixty-six million, six hundred seventy-three thousand, seven hundred eighty-seven".