66703667 has 2 divisors, whose sum is σ = 66703668. Its totient is φ = 66703666.

The previous prime is 66703639. The next prime is 66703691. The reversal of 66703667 is 76630766.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66703667 - 2⁶ = 66703603 is a prime.

It is not a weakly prime, because it can be changed into another prime (66703607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33351833 + 33351834.

It is an arithmetic number, because the mean of its divisors is an integer number (33351834).

Almost surely, 2^66703667 is an apocalyptic number.

66703667 is a deficient number, since it is larger than the sum of its proper divisors (1).

66703667 is an equidigital number, since it uses as much as digits as its factorization.

66703667 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 190512, while the sum is 41.

The square root of 66703667 is about 8167.2312934066. The cubic root of 66703667 is about 405.5551336651. Note that the first 3 decimals are identical.

The spelling of 66703667 in words is "sixty-six million, seven hundred three thousand, six hundred sixty-seven".