66909067 has 4 divisors (see below), whose sum is σ = 69067456. Its totient is φ = 64750680.

The previous prime is 66909023. The next prime is 66909091. The reversal of 66909067 is 76090966.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 66909067 - 2⁷ = 66908939 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66909767) 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, 1079148 + ... + 1079209.

It is an arithmetic number, because the mean of its divisors is an integer number (17266864).

Almost surely, 2^66909067 is an apocalyptic number.

66909067 is a deficient number, since it is larger than the sum of its proper divisors (2158389).

66909067 is a wasteful number, since it uses less digits than its factorization.

66909067 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2158388.

The product of its (nonzero) digits is 122472, while the sum is 43.

The square root of 66909067 is about 8179.7962688566. The cubic root of 66909067 is about 405.9709812063.

The spelling of 66909067 in words is "sixty-six million, nine hundred nine thousand, sixty-seven".