66700693 has 2 divisors, whose sum is σ = 66700694. Its totient is φ = 66700692.

The previous prime is 66700691. The next prime is 66700717. The reversal of 66700693 is 39600766.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 38217124 + 28483569 = 6182^2 + 5337^2 .

It is a cyclic number.

It is not a de Polignac number, because 66700693 - 2¹ = 66700691 is a prime.

Together with 66700691, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66700691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33350346 + 33350347.

It is an arithmetic number, because the mean of its divisors is an integer number (33350347).

Almost surely, 2^66700693 is an apocalyptic number.

It is an amenable number.

66700693 is a deficient number, since it is larger than the sum of its proper divisors (1).

66700693 is an equidigital number, since it uses as much as digits as its factorization.

66700693 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 40824, while the sum is 37.

The square root of 66700693 is about 8167.0492223324. The cubic root of 66700693 is about 405.5491063159.

The spelling of 66700693 in words is "sixty-six million, seven hundred thousand, six hundred ninety-three".