66704387 has 2 divisors, whose sum is σ = 66704388. Its totient is φ = 66704386.

The previous prime is 66704371. The next prime is 66704411. The reversal of 66704387 is 78340766.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66704387 - 2⁴ = 66704371 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (66704317) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33352193 + 33352194.

It is an arithmetic number, because the mean of its divisors is an integer number (33352194).

Almost surely, 2^66704387 is an apocalyptic number.

66704387 is a deficient number, since it is larger than the sum of its proper divisors (1).

66704387 is an equidigital number, since it uses as much as digits as its factorization.

66704387 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 169344, while the sum is 41.

The square root of 66704387 is about 8167.2753718728. The cubic root of 66704387 is about 405.5565928485.

The spelling of 66704387 in words is "sixty-six million, seven hundred four thousand, three hundred eighty-seven".