66700505 has 8 divisors (see below), whose sum is σ = 80625672. Its totient is φ = 52970368.

The previous prime is 66700477. The next prime is 66700519. The reversal of 66700505 is 50500766.

It can be written as a sum of positive squares in 4 ways, for example, as 375769 + 66324736 = 613^2 + 8144^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66700505 - 2⁶ = 66700441 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48002 + ... + 49371.

It is an arithmetic number, because the mean of its divisors is an integer number (10078209).

Almost surely, 2^66700505 is an apocalyptic number.

It is an amenable number.

66700505 is a deficient number, since it is larger than the sum of its proper divisors (13925167).

66700505 is a wasteful number, since it uses less digits than its factorization.

66700505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97515.

The product of its (nonzero) digits is 6300, while the sum is 29.

The square root of 66700505 is about 8167.0377126593. The cubic root of 66700505 is about 405.5487252938.

The spelling of 66700505 in words is "sixty-six million, seven hundred thousand, five hundred five".