66700571 has 16 divisors (see below), whose sum is σ = 81031104. Its totient is φ = 53597184.

The previous prime is 66700559. The next prime is 66700573. The reversal of 66700571 is 17500766.

It is a cyclic number.

It is not a de Polignac number, because 66700571 - 2¹⁴ = 66684187 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66700573) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33911 + ... + 35823.

It is an arithmetic number, because the mean of its divisors is an integer number (5064444).

Almost surely, 2^66700571 is an apocalyptic number.

66700571 is a deficient number, since it is larger than the sum of its proper divisors (14330533).

66700571 is a wasteful number, since it uses less digits than its factorization.

66700571 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2230.

The product of its (nonzero) digits is 8820, while the sum is 32.

The square root of 66700571 is about 8167.0417532911. The cubic root of 66700571 is about 405.5488590569.

The spelling of 66700571 in words is "sixty-six million, seven hundred thousand, five hundred seventy-one".