66666707 has 8 divisors (see below), whose sum is σ = 70705296. Its totient is φ = 62641152.

The previous prime is 66666683. The next prime is 66666713. The reversal of 66666707 is 70766666.

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 66666707 - 2⁶ = 66666643 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66666007) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8528 + ... + 14354.

It is an arithmetic number, because the mean of its divisors is an integer number (8838162).

Almost surely, 2^66666707 is an apocalyptic number.

66666707 is a deficient number, since it is larger than the sum of its proper divisors (4038589).

66666707 is a wasteful number, since it uses less digits than its factorization.

66666707 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6517.

The product of its (nonzero) digits is 381024, while the sum is 44.

The square root of 66666707 is about 8164.9682791790. The cubic root of 66666707 is about 405.4802148100.

The spelling of 66666707 in words is "sixty-six million, six hundred sixty-six thousand, seven hundred seven".