66703607 has 2 divisors, whose sum is σ = 66703608. Its totient is φ = 66703606.

The previous prime is 66703603. The next prime is 66703613. The reversal of 66703607 is 70630766.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66703607 - 2² = 66703603 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66703601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33351803 + 33351804.

It is an arithmetic number, because the mean of its divisors is an integer number (33351804).

Almost surely, 2^66703607 is an apocalyptic number.

66703607 is a deficient number, since it is larger than the sum of its proper divisors (1).

66703607 is an equidigital number, since it uses as much as digits as its factorization.

66703607 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 31752, while the sum is 35.

The square root of 66703607 is about 8167.2276201903. The cubic root of 66703607 is about 405.5550120660. Note that the first 3 decimals are identical.

The spelling of 66703607 in words is "sixty-six million, seven hundred three thousand, six hundred seven".