66211707 has 16 divisors (see below), whose sum is σ = 89527680. Its totient is φ = 43522752.

The previous prime is 66211703. The next prime is 66211711. The reversal of 66211707 is 70711266.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (66211703) and next prime (66211711).

It is not a de Polignac number, because 66211707 - 2² = 66211703 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66211703) 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, 100144 + ... + 100802.

It is an arithmetic number, because the mean of its divisors is an integer number (5595480).

Almost surely, 2^66211707 is an apocalyptic number.

66211707 is a deficient number, since it is larger than the sum of its proper divisors (23315973).

66211707 is a wasteful number, since it uses less digits than its factorization.

66211707 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1082.

The product of its (nonzero) digits is 3528, while the sum is 30.

The square root of 66211707 is about 8137.0576377460. The cubic root of 66211707 is about 404.5556412748. Note that the first 3 decimals are identical.

The spelling of 66211707 in words is "sixty-six million, two hundred eleven thousand, seven hundred seven".