66700507 has 4 divisors (see below), whose sum is σ = 70211080. Its totient is φ = 63189936.

The previous prime is 66700477. The next prime is 66700519. The reversal of 66700507 is 70500766.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 66700507 - 2¹⁹ = 66176219 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66700547) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1755258 + ... + 1755295.

It is an arithmetic number, because the mean of its divisors is an integer number (17552770).

Almost surely, 2^66700507 is an apocalyptic number.

66700507 is a deficient number, since it is larger than the sum of its proper divisors (3510573).

66700507 is a wasteful number, since it uses less digits than its factorization.

66700507 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3510572.

The product of its (nonzero) digits is 8820, while the sum is 31.

The square root of 66700507 is about 8167.0378351028. The cubic root of 66700507 is about 405.5487293472.

The spelling of 66700507 in words is "sixty-six million, seven hundred thousand, five hundred seven".