66700307 has 4 divisors (see below), whose sum is σ = 68503056. Its totient is φ = 64897560.

The previous prime is 66700303. The next prime is 66700321. The reversal of 66700307 is 70300766.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 70300766 = 2 ⋅35150383.

It is a cyclic number.

It is not a de Polignac number, because 66700307 - 2² = 66700303 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66700307.

It is not an unprimeable number, because it can be changed into a prime (66700303) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 901319 + ... + 901392.

It is an arithmetic number, because the mean of its divisors is an integer number (17125764).

Almost surely, 2^66700307 is an apocalyptic number.

66700307 is a deficient number, since it is larger than the sum of its proper divisors (1802749).

66700307 is a wasteful number, since it uses less digits than its factorization.

66700307 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1802748.

The product of its (nonzero) digits is 5292, while the sum is 29.

The square root of 66700307 is about 8167.0255907521. The cubic root of 66700307 is about 405.5483240039.

The spelling of 66700307 in words is "sixty-six million, seven hundred thousand, three hundred seven".