66840467 has 4 divisors (see below), whose sum is σ = 66878136. Its totient is φ = 66802800.

The previous prime is 66840457. The next prime is 66840491. The reversal of 66840467 is 76404866.

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 66840467 - 2²² = 62646163 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66840407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16034 + ... + 19767.

It is an arithmetic number, because the mean of its divisors is an integer number (16719534).

Almost surely, 2^66840467 is an apocalyptic number.

66840467 is a deficient number, since it is larger than the sum of its proper divisors (37669).

66840467 is a wasteful number, since it uses less digits than its factorization.

66840467 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37668.

The product of its (nonzero) digits is 193536, while the sum is 41.

The square root of 66840467 is about 8175.6019350259. The cubic root of 66840467 is about 405.8321901884.

The spelling of 66840467 in words is "sixty-six million, eight hundred forty thousand, four hundred sixty-seven".