66670771 has 4 divisors (see below), whose sum is σ = 67006000. Its totient is φ = 66335544.

The previous prime is 66670759. The next prime is 66670777. The reversal of 66670771 is 17707666.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66670771 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66670777) 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, 167316 + ... + 167713.

It is an arithmetic number, because the mean of its divisors is an integer number (16751500).

Almost surely, 2^66670771 is an apocalyptic number.

66670771 is a deficient number, since it is larger than the sum of its proper divisors (335229).

66670771 is a wasteful number, since it uses less digits than its factorization.

66670771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 335228.

The product of its (nonzero) digits is 74088, while the sum is 40.

The square root of 66670771 is about 8165.2171434690. The cubic root of 66670771 is about 405.4884539956.

The spelling of 66670771 in words is "sixty-six million, six hundred seventy thousand, seven hundred seventy-one".